Facebook

Name	Primary Language	I Use This	Community Rating	12-month Activity & Year-on-Year Change

Name	Primary Language	I Use This	Community Rating	Contributors	Commits
React from Facebook	JavaScript	14	5.0
				Affiliated: —	—
				Outside: 72 -21 (22%)	690 -59 (7%)
HipHop Virtual Machi...	C++	10	5.0
				Affiliated: —	—
				Outside: 608 +155 (34%)	18738 +3280 (21%)
Facebook Presto	Java	4	none
				Affiliated: —	—
				Outside: 172 -8 (4%)	3103 +917 (41%)
react-native	JavaScript	2	none
				Affiliated: —	—
				Outside: 412 +30 (7%)	3761 +1212 (47%)
RocksDB	C++	1	none
				Affiliated: —	—
				Outside: —	—
Buck	Java	1	none
				Affiliated: —	—
				Outside: 1 -1 (50%)	1 -4 (80%)
F Facebook Flow	OCaml	1	none
				Affiliated: —	—
				Outside: 46 -12 (20%)	1989 -28 (1%)
F Facebook Infer	N/A	1	none
				Affiliated: —	—
				Outside: —	—
pyre-check	OCaml	0	none
				Affiliated: —	—
				Outside: 47 -14 (22%)	1806 -796 (30%)
F Facebook CParser	Lua	0	none
				Affiliated: —	—
				Outside: — -2 (100%)	— -3 (100%)
A AsyncDisplayKit	Objective-C	0	none
				Affiliated: —	—
				Outside: —	—