Valve requires that all Source 2 games be sold through

Valve's Source 2 engine will be free for developers to use, which seems to be the way a lot of graphics engines are

CSGO Source 2 looks almost certain as Valve adds 'CS2' to Steam

Counter-Strike Source 2 Release Date and leaks – Stryda

Valve didn't want to make another Half-Life game before Source 2 was ready

Valve bringing 'Artifact' card game to iOS as company's first mobile title using the Source 2 engine

Valve on Source 2 : r/GlobalOffensive

Valve working on new Source engine

Valve Announces Source 2, And It'll Be Free

Source Games on Source 2

CSGO: Source 2 Coming To CSGO Soon?

Major source code leak threatens Valve games including Team Fortress 2, CS:GO and potentially more - Inven Global

What is Source 2 and How Will It Impact CS:GO?, DMarket

Left 4 Dead 3 and Source 2 spotted during Valve tour

Source 2 Is Free, And Valve Wants You To Make Games With It

Exclusive interview: Valve on the future of Counter-Strike 2

Source 2 Tools Will Ship with Half-Life: Alyx for the Modding Community