All-ArtsHQ

Ok

"Source Filmmaker (abbreviated as sfm) is a video capture and editing application that works from inside the Source game engine.^[5][6] The tool, created by Valve Corporation, was used to create over 50 animated shorts for its Source games, including Team Fortress 2, the Left 4 Dead series, and Half-Life 2. On June 27, 2012, Valve released a free open beta version of the SFM to the gaming community via its Steam service.^[1][2][7][8]  Unlike most movie-making tools, which only create a small part of a movie, the Source Filmmaker merges all animation and effect workflows onto a single PC. With SFM, one can create movies and posters by using assets and events from the video game world, providing creators with a "'what you see is what you get' environment".^[4][7] "

"Garry's Mod (commonly abbreviated as Gmod and typecased as garry's mod), is a sandbox physics game created by Garry Newman,^[1] and developed by his company,Facepunch Studios.^[2] Garry's Mod was originally a mod for Valve Corporation's Half-Life 2, but was later made into a standalone release in 2006 for Microsoft Windows, published by Valve Corporation. Later updates saw an OS X port added in 2010, and a version for Linux in 2013."

^{There's what I could find, hope it helps}