sentences:  Around this time many companies, starting with id Software, also began to release legacy source code leading to a proliferation of source ports of older games to Linux and other systems.This also helped expand the already existing free and open-source gaming scene, especially with regards to the creation of free first person shooters.The Linux gaming market also started to experience some growth towards the end of the decade with the rise of independent video game development, with many "indie" developers favouring support for multiple platforms.