<s>
Kamaelia	B-Language
is	O
a	O
free	O
software/open	O
source	O
Python-based	B-Language
systems-development	O
tool	O
and	O
concurrency	B-Operating_System
framework	O
produced	O
by	O
BBC	B-Application
Research	I-Application
&	I-Application
Development	I-Application
.	O
</s>
<s>
Kamaelia	B-Language
applications	O
are	O
produced	O
by	O
linking	O
independent	O
components	O
together	O
.	O
</s>
<s>
These	O
components	O
communicate	O
entirely	O
through	O
"	O
inboxes	O
"	O
and	O
"	O
outboxes	O
"	O
(	O
queues	O
)	O
largely	O
removing	O
the	O
burdens	O
of	O
thread-safety	O
and	O
IPC	B-Operating_System
from	O
the	O
developer	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
switching	O
between	O
the	O
execution	O
of	O
components	O
in	O
Kamaelia	B-Language
systems	O
is	O
very	O
fast	O
.	O
</s>
<s>
Applications	O
that	O
have	O
been	O
produced	O
using	O
Kamaelia	B-Language
include	O
a	O
Freeview	B-Device
digital	B-Application
video	I-Application
recorder	I-Application
,	O
a	O
network-shared	B-Protocol
whiteboard	I-Protocol
,	O
a	O
3D	O
GUI	B-Application
,	O
an	O
HTTP	B-Application
Server	I-Application
,	O
an	O
audio	O
mixer	O
,	O
a	O
stream	O
multicasting	O
system	O
and	O
a	O
simple	O
BitTorrent	O
client	O
.	O
</s>
<s>
Kamaelia	B-Language
's	O
License	O
changed	O
in	O
July	O
2010	O
from	O
the	O
Mozilla	O
tri-license	O
(	O
MPL	B-License
,	O
GPL	B-License
and	O
LGPL	B-Application
)	O
to	O
the	O
Apache	B-Application
License	I-Application
,	O
with	O
a	O
note	O
that	O
usage	O
under	O
the	O
old	O
licensing	O
scheme	O
was	O
permitted	O
if	O
necessary	O
(	O
due	O
to	O
license	O
incompatibilities	O
)	O
,	O
given	O
the	O
rationale	O
for	O
change	O
was	O
to	O
make	O
the	O
codebase	O
more	O
usable	O
by	O
developers	O
not	O
less	O
.	O
</s>
