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	15	5.0
				Affiliated: —	—
				Outside: 91 -12 (11%)	843 -596 (41%)
HipHop Virtual Machi...	C++	10	5.0
				Affiliated: —	—
				Outside: 834 +169 (25%)	20260 +2560 (14%)
Facebook Presto	Java	4	none
				Affiliated: —	—
				Outside: 176 -18 (9%)	2733 -81 (2%)
react-native	JavaScript	2	none
				Affiliated: —	—
				Outside: 349 -5 (1%)	3132 -2355 (42%)
F Facebook Flow	Rust	2	none
				Affiliated: —	—
				Outside: 51 +13 (34%)	2264 +921 (68%)
F Facebook Infer	N/A	1	none
				Affiliated: —	—
				Outside: —	—
RocksDB	C++	1	none
				Affiliated: —	—
				Outside: — -1 (100%)	— -3 (100%)
Buck	Java	1	none
				Affiliated: —	—
				Outside: —	—
F Facebook CParser	Lua	0	none
				Affiliated: —	—
				Outside: —	—
pyre-check	OCaml	0	none
				Affiliated: —	—
				Outside: 32 -25 (43%)	495 -3351 (87%)
A AsyncDisplayKit	Objective-C	0	none
				Affiliated: —	—
				Outside: —	—