<s>
PX4	B-Application
autopilot	I-Application
is	O
an	O
open-source	O
autopilot	O
system	O
oriented	O
toward	O
inexpensive	O
autonomous	O
aircraft	O
.	O
</s>
<s>
Several	O
vendors	O
are	O
currently	O
producing	O
PX4	B-Application
autopilots	I-Application
and	O
accessories	O
.	O
</s>
<s>
PX4	O
is	O
open-source	O
and	O
available	O
under	O
a	O
BSD-3-Clause	B-Operating_System
license	O
.	O
</s>
<s>
For	O
an	O
up-to-date	O
and	O
complete	O
list	O
of	O
the	O
hardware	O
supported	O
by	O
the	O
PX4	B-Application
Autopilot	I-Application
,	O
visit	O
their	O
website	O
.	O
</s>
