<s>
This	O
is	O
a	O
list	O
of	O
notable	O
applications	B-Application
(	O
apps	O
)	O
that	O
run	O
on	O
the	O
Android	B-Application
platform	I-Application
which	O
meet	O
guidelines	O
for	O
free	B-Application
software	I-Application
and	O
open-source	B-Application
software	I-Application
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Aptoide	B-Application
F-Droid	B-Application
Google	B-Application
Play	I-Application
Brave	B-Application
Chromium-based	O
web	B-Application
browser	I-Application
with	O
emphasis	O
on	O
tracking	B-Application
prevention	O
,	O
and	O
reforming	O
ad-blocking	O
MPL	B-License
4.1	O
+	O
Has	O
in-built	O
ad	O
blocker	O
Chromium	B-Language
Primary	O
code-base	O
of	O
Chrome	B-Application
;	O
uses	O
Blink	B-Language
and	O
V8	B-Language
engines	O
BSD4.4	O
+	O
DuckDuckGo	B-Application
Chromium-based	O
;	O
focuses	O
on	O
privacy	O
&	O
tracking	B-Application
protection	O
Apache	O
2.0	O
5.0	O
+	O
Fennec	B-Application
F-Droid	B-Application
Rebadged	O
fork	B-Application
of	O
Firefox	O
;	O
aims	O
to	O
remove	O
proprietary	B-Application
components	O
MPL	B-License
4.1	O
+	O
Same	O
with	O
Firefox	B-Application
for	I-Application
Android	I-Application
,	O
but	O
some	O
proprietary	B-Application
code	O
removed	O
.	O
</s>
<s>
Firefox	B-Application
for	I-Application
Android	I-Application
Customizable	O
with	O
add-ons	B-Operating_System
;	O
uses	O
Gecko	B-Language
engine	I-Language
MPL	B-License
4.1	O
+	O
Removed	O
from	O
F-Droid	B-Application
Firefox	O
Focus/Klar	O
Privacy	O
centered	O
browser	B-Application
;	O
uses	O
Gecko	B-Language
engine	I-Language
(	O
GeckoView	B-Language
)	O
MPL	B-License
5.0	O
+	O
GNU	B-Application
IceCat	I-Application
GNU	B-Application
Project	I-Application
version	O
of	O
Firefox	O
MPL	B-License
4.0.3	O
+	O
IceCat	O
contains	O
features	O
not	O
found	O
in	O
mainline	O
Firefox	O
release	O
and	O
eschews	O
all	O
usage	O
of	O
proprietary	B-Application
components	O
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
ConnectBot	B-Language
SSH	B-Protocol
,	O
telnet	B-Protocol
,	O
and	O
terminal	B-Application
emulator	I-Application
Apache	O
2.0	O
1.5	O
+	O
CSipSimple	B-Application
SIP	B-Application
&	O
VoIP	B-Application
client	O
GPLv3	O
1.6	O
+	O
Jitsi	B-Protocol
Videoconferencing	B-Application
and	O
instant	B-Application
messenger	I-Application
LGPLv2.1	O
K-9	B-Application
Mail	I-Application
Advanced	O
email	O
client	O
Apache	O
2.0	O
2.2	O
+	O
Supports	O
OpenPGP	O
integration	O
with	O
OpenKeychain	O
Linphone	B-Protocol
Video	O
SIP/VoIP	O
client	O
GPLv2	O
2.2	O
+	O
Element	B-Protocol
Federated	O
instant	B-Application
messaging	I-Application
and	O
group	O
chat	O
client	O
using	O
the	O
Matrix	B-Protocol
protocol	I-Protocol
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
APG	O
OpenPGP	O
and	O
key	O
management	O
Apache	O
2.0	O
1.5	O
+	O
OpenKeychain	O
available	O
as	O
more	O
up-to-date	O
alternative	O
Briar	B-Protocol
Peer-to-peer	O
encrypted	O
messaging	O
and	O
forums	O
GPLv3	O
4.0	O
+	O
Conversations	B-Protocol
Federated	O
encrypted	O
instant	B-Application
messaging	I-Application
and	O
group	O
chat	O
GPLv3	O
4.0	O
+	O
Interoperable	O
with	O
any	O
Jabber/XMPP	B-Protocol
clients	O
.	O
</s>
<s>
End-to-end	O
encryption	O
using	O
OMEMO	B-Application
,	O
OpenPGP	O
(	O
and	O
OTR	B-Protocol
for	O
versions	O
under	O
2.0	O
and	O
the	O
legacy	O
version	O
)	O
.Element	O
(	O
formerly	O
Riot	O
)	O
Decentralised	O
,	O
encrypted	O
chat	O
&	O
collaboration	O
powered	O
by	O
Matrix	B-Protocol
Apache	O
2.05.0	O
+	O
I2P	B-Protocol
Anonymizing	O
network	B-Application
layer	I-Application
Apache	O
2.0	O
2.3	O
+	O
I2P	B-Protocol
also	O
maintain	O
their	O
own	O
F-Droid	B-Application
repo	O
.	O
</s>
<s>
IVPN	B-Application
Privacy-focused	O
VPN	B-Application
service	O
GPLv3	O
Also	O
available	O
on	O
Windows	O
,	O
macOS	O
,	O
and	O
iOS	O
;	O
and	O
undergo	O
independent	O
security	O
audit	O
.	O
</s>
<s>
Jami	B-Protocol
Softphone	O
and	O
messenger	O
utilizing	O
DHT	O
and	O
strong	O
cryptography	O
GPLv3	O
Formerly	O
named	O
"	O
GNU	B-Protocol
Ring	I-Protocol
"	O
and	O
"	O
SFLphone	B-Protocol
"	O
.	O
</s>
<s>
Lantern	B-Language
Peer-to-peer	O
internet	B-Application
censorship	I-Application
circumvention	I-Application
Apache	O
2.0	O
Mozilla	B-Operating_System
VPN	I-Operating_System
VPN	B-Application
service	O
MPL	B-License
2.0	I-License
Also	O
available	O
for	O
iOS	O
,	O
Linux	B-Application
,	O
macOS	O
,	O
and	O
Windows	O
Mullvad	B-Application
Privacy-focused	O
VPN	B-Application
service	O
GPLv3	O
Also	O
available	O
for	O
Windows	O
,	O
macOS	O
,	O
and	O
iOS	O
OpenKeychain	O
OpenPGP	O
and	O
key	O
management	O
GPLv3	O
Integrates	O
with	O
K-9	B-Application
Mail	I-Application
.	O
</s>
<s>
Orbot	B-Language
Client	O
and	O
proxy	O
for	O
Tor	B-Application
anonymity	I-Application
network	I-Application
BSD/GPL	O
1.6	O
+	O
Psiphon	B-Application
Client	O
for	O
internet	B-Application
censorship	I-Application
circumvention	I-Application
system	O
GPLv3	O
ProtonMail	B-Application
Client	O
end-to-end	O
encrypted	B-Protocol
email	I-Protocol
service	O
GPLv3	O
Open	O
source	O
apps	O
on	O
WEB	O
app	O
,	O
Android	B-Application
,	O
IOS	O
,	O
Bridge	O
app	O
.	O
</s>
<s>
ProtonVPN	B-Application
Privacy-focused	O
VPN	B-Application
service	O
GPLv3	O
Also	O
available	O
for	O
Windows	O
,	O
macOS	O
,	O
and	O
iOS	O
;	O
and	O
undergo	O
independent	O
security	O
audits	O
.	O
</s>
<s>
Signal	B-Application
Encrypted	O
instant	B-Application
messaging	I-Application
,	O
voice	O
and	O
video	B-Application
calling	I-Application
GPLv3	O
2.3	O
+	O
Also	O
available	O
for	O
iOS	O
.	O
</s>
<s>
The	O
Android	B-Application
client	I-Application
is	O
a	O
merger	O
of	O
the	O
former	O
TextSecure	B-Protocol
and	O
RedPhone	O
apps	O
.	O
</s>
<s>
Surespot	B-Protocol
Encrypted	O
instant	B-Application
messaging	I-Application
GPLv3+	O
Also	O
available	O
for	O
iOS	O
.	O
</s>
<s>
F-Droid	B-Application
build	O
is	O
based	O
on	O
forked	O
repo	O
.	O
</s>
<s>
Telegram	B-Application
Client	O
for	O
cloud-based	B-Architecture
messaging	O
platform	O
GPLv2	O
2.2	O
+	O
Also	O
available	O
for	O
iOS	O
.	O
</s>
<s>
F-Droid	B-Application
build	O
is	O
based	O
on	O
forked	O
repo	O
.	O
</s>
<s>
Server	O
uses	O
closed	B-Application
source	I-Application
software	I-Application
.	O
</s>
<s>
Tox	B-Protocol
Peer-to-peer	O
instant-messaging	O
GPLv3+	O
4.0	O
+	O
Alpha	O
release	O
Tutanota	B-Operating_System
Client	O
for	O
end-to-end	O
encrypted	B-Protocol
email	I-Protocol
service	O
GPLv3	O
Wire	B-Application
Encrypted	O
instant	B-Application
messaging	I-Application
,	O
voice	O
and	O
video	B-Application
calling	I-Application
GPLv3	O
Also	O
available	O
for	O
iOS	O
,	O
Windows	O
and	O
OS	O
X	O
.	O
Server	O
uses	O
closed	B-Application
source	I-Application
software	I-Application
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
Citra	B-Application
Nintendo	B-Operating_System
3DS	I-Operating_System
GPLv2	O
Dolphin	B-Application
Nintendo	B-Application
GameCube	I-Application
and	O
Wii	B-Operating_System
GPLv2+	O
5.0	O
+	O
Requires	O
device	O
with	O
support	O
for	O
arm64-v8a	O
ABI	O
and	O
OpenGL	B-Application
ES	I-Application
3	O
or	O
above	O
Mupen64Plus	B-Application
Nintendo	B-Operating_System
64	I-Operating_System
emulator	O
GPLv3	O
2.0	O
+	O
Unofficial	O
port	O
as	O
Mupen64	B-Application
Plus	O
AE	O
.	O
</s>
<s>
openMSX	B-Application
MSX	B-Operating_System
GPLv2+	O
PPSSPP	B-Language
PlayStation	B-Operating_System
Portable	I-Operating_System
GPLv2+	O
2.3	O
+	O
RetroArch	B-Application
Emulates	O
multiple	O
platforms	O
GPLv3RetroArch	O
/	O
COPYING	O
.	O
</s>
<s>
github.com	B-Application
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
2048	B-Application
Mathematics	O
sliding	O
block	O
puzzle	O
MIT	B-License
2.2	O
+	O
Port	O
of	O
2048	B-Application
Angband	B-Application
Text-based	O
roguelike	O
GPLv2	O
Battle	B-Application
for	I-Application
Wesnoth	I-Application
Turn-based	O
strategy	O
in	O
a	O
fantasy	O
setting	O
GPLv2	O
2.3	O
+	O
Ported	O
to	O
Android	B-Application
with	O
SDL	B-Operating_System
Brogue	B-Application
Roguelike	O
GPLv3	O
Dungeon	B-Language
Crawl	I-Language
Stone	I-Language
Soup	I-Language
Roguelike	O
GPLv2+	O
Text-based	O
version	O
also	O
available	O
Fish	B-Application
Fillets	I-Application
NG	I-Application
Underwater	O
puzzle	O
game	O
.	O
</s>
<s>
GPLv2	O
1.6	O
+	O
Port	O
of	O
Fish	B-Application
Fillets	I-Application
NG	I-Application
Freeciv	B-Application
Turn-based	O
strategy	O
game	O
similar	O
to	O
Sid	B-Application
Meier	I-Application
's	I-Application
Civilization	I-Application
GPLv2	O
2.0	O
+	O
Frozen	B-Language
Bubble	I-Language
Tile-matching	B-Application
puzzle	O
game	O
GPLv2	O
1.6	O
+	O
Port	O
of	O
Frozen	B-Language
Bubble	I-Language
GLtron	B-Application
Lightcycle	O
racing	O
game	O
GPLv2	O
2.2	O
+	O
Port	O
of	O
GLtron	B-Application
H-Craft	B-Application
Championship	I-Application
SciFi	O
3D	O
racing	O
game	O
zlib	B-License
3.2	O
+	O
Media	O
is	O
proprietary	B-Application
,	O
but	O
free	O
for	O
personal	O
use	O
.	O
</s>
<s>
PIXEL	O
DUNGEON	O
FOR	O
ANDROID	B-Application
–	O
A	O
SURPRISINGLY	O
GOOD	O
(	O
FREE	O
)	O
ROGUELIKE	O
.	O
</s>
<s>
(	O
8	O
March	O
2018	O
)	O
Roguelike	O
with	O
pixel	O
art	O
graphics	O
GPLv3	O
Also	O
available	O
for	O
Linux	B-Application
,	O
iOS	O
,	O
Windows	O
10	O
,	O
Mac	O
OS	O
X	O
OpenTyrian	O
Vertical	O
shoot	O
'	O
em	O
up	O
GPLv2	O
1.6	O
+	O
pelya	O
SDL	B-Operating_System
port	O
robotfindskitten	B-Application
A	O
"	O
Zen	O
Simulation	O
"	O
GPL	O
1.6	O
+	O
Simon	O
Tatham	O
's	O
Puzzle	O
Collection	O
Collection	O
of	O
puzzle	O
games	O
MIT	B-License
2.1	O
+	O
Ur-Quan	O
MastersSource-port	O
of	O
3DO	B-Device
version	O
of	O
Star	B-Application
Control	I-Application
II	I-Application
GPLv2+	O
,	O
CC	O
by	O
2.0	O
,	O
CC	O
by-nc-sa	O
2.5Game	O
engine	O
is	O
free	O
,	O
but	O
Star	O
Control	O
art	O
assets	O
are	O
released	O
under	O
a	O
Creative	O
Commons	O
non-commercial	O
license	B-License
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
Dasher	B-Language
Accessible	O
text-input	O
method	O
GPLv3	O
Also	O
available	O
for	O
iOS	O
FetLife	O
Social	O
network	O
catering	O
to	O
the	O
BDSM	O
,	O
fetish	O
,	O
and	O
kink	O
communities	O
MIT	B-License
fetlife/android/README.md	O
.	O
</s>
<s>
GitHub	B-Application
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
AntennaPod	B-Application
Podcatcher	O
MIT	B-License
2.3.3	O
+	O
Butter	O
ProjectMedia	O
player	O
utilising	O
the	O
BitTorrent	B-Protocol
protocol	I-Protocol
AGPLv3	O
Kodi	B-Application
(	O
formerly	O
XBMC	B-Application
)	O
Media	O
player	O
and	O
center	O
GPLv2+	O
Multi	O
Popcorn	B-Protocol
Time	I-Protocol
Media	O
player	O
utilizing	O
BitTorrent	B-Protocol
protocol	I-Protocol
GPLv3+( AGPL	O
exception	O
)	O
Popcorn	B-Protocol
Time	I-Protocol
Foundation	O
.	O
</s>
<s>
android	B-Application
/	O
LICENSE.md	O
.	O
</s>
<s>
git.popcorntime.io	O
.	O
</s>
<s>
In	O
Nov	O
.	O
of	O
2015	O
PopcornTime.io	O
ceased	O
operations	O
after	O
court	O
order	O
from	O
the	O
MPAA	O
issued	O
in	O
Canada	O
.	O
</s>
<s>
Ringdroid	B-Application
Ringtone	O
maker	O
Apache	O
2.0	O
4.1	O
+	O
Rockbox	B-Application
Media	O
player	O
GPLv2+	O
Tribler	B-Language
Decentralized	O
video	O
sharing	O
GPLv3	O
3.0	O
+	O
Tux	B-Language
Paint	I-Language
Simple	O
drawing	O
program	O
for	O
children	O
GPLv2	O
Version	O
on	O
Google	B-Application
Play	I-Application
is	O
published	O
by	O
a	O
3rd-party	O
&	O
contains	O
proprietary	B-Application
ad	O
libraries	O
in	O
violation	O
of	O
upstream	O
developers	O
 '	O
license	B-License
VLC	B-Application
Media	O
player	O
GPLv2+	O
4.2	O
+	O
Wikimedia	O
Commons	O
Client	O
for	O
free	O
media	O
repository	O
Apache	O
2.0	O
4.4	O
+	O
Old	O
CommonsLab	O
app	O
no	O
longer	O
maintained	O
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
Avare	B-Application
GPS	O
aviation	O
application	O
Github	B-Application
4.4	O
+	O
Complete	O
*	O
Aviation*	O
EFB	O
&	O
nav	O
app	O
with	O
all	O
official	O
current	O
U.S.A.	O
FAA	O
VFR	O
&	O
IFR	O
charts	O
&	O
data	O
,	O
plus	O
limited	O
free	O
unofficial	O
non-US	O
materials	O
.	O
</s>
<s>
MAPS.ME	B-Application
Offline	O
mapping	O
using	O
OpenStreetMap	O
data	O
Apache	O
2.0	O
F-Droid	B-Application
version	O
is	O
an	O
unofficial	O
fork	B-Application
,	O
with	O
extra	O
features	O
and	O
removed	O
proprietary	B-Application
binaries	O
.	O
</s>
<s>
Mozilla	O
Stumbler	O
Data	O
gathering	O
for	O
Mozilla	O
Location	O
Service	O
MPL2	B-License
2.3.3	O
+	O
OsmAnd	B-Application
Offline	O
mapping	O
using	O
OpenStreetMap	O
data	O
GPLv3	O
2.3	O
+	O
Only	O
parts	O
of	O
the	O
software	O
are	O
available	O
at	O
no	O
cost	O
,	O
this	O
cause	O
the	O
software	O
to	O
get	O
a	O
few	O
arbitrary	O
limitation	O
as	O
limited	O
portion	O
maps	O
of	O
openstreetmap	O
may	O
be	O
loaded	O
.	O
</s>
<s>
The	O
unlimited	O
version	O
is	O
also	O
available	O
for	O
free	O
on	O
F-Droid	B-Application
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
BOINC	B-Operating_System
Participate	O
in	O
distributed	O
grid	B-Architecture
computing	I-Architecture
initiatives	O
LGPL/GPLv3	O
+	O
2.3	O
+	O
Galaxy	O
Zoo	O
Classify	O
galaxies	O
in	O
crowdsourced	O
astronomy	O
project	O
GPLv3	O
3.0	O
+	O
GCompris	B-Language
Educational	O
activity	O
suite	O
for	O
children	O
aged	O
2	O
–	O
10	O
GPLv3	O
Member	O
project	O
of	O
KDE	B-Application
GNU	B-Language
Octave	I-Language
Scientific	O
programming	O
language	O
syntax	O
with	O
built-in	O
plotting	O
and	O
visualization	O
tools	O
GPLv3	O
micro:bit	O
Interact	O
with	O
a	O
micro:bit	O
device	O
via	O
Bluetooth	B-Protocol
Apache	O
2.0	O
Developed	O
by	O
Samsung	O
.	O
</s>
<s>
Depends	O
on	O
proprietary	B-Application
Google	B-Application
frameworks	O
.	O
</s>
<s>
Application	O
name	O
Description	O
AvailabilityLicense	O
API	B-Application
Note	O
Google	B-Application
Play	I-Application
F-Droid	B-Application
Barcode	O
Scanner	O
Barcode	O
and	O
QR	O
Code	O
reader	O
Apache	O
2.0	O
4.0.3	O
+	O
F-Droid	B-Application
Graphical	O
package	B-Application
manager	I-Application
for	O
app	B-Application
repositories	I-Application
GPLv3+	O
4.0	O
+	O
F-Droid	B-Application
team	O
also	O
maintain	O
an	O
application	O
repository	O
Impress	B-Application
Remote	I-Application
Presentation	O
remote	O
control	O
for	O
LibreOffice	B-Application
MPL2F-Droid	O
-	O
Impress	B-Application
Remote	I-Application
.	O
</s>
<s>
f-droid.org	O
.	O
</s>
