In January, publishing rights for classic Fallout games transferred from Interplay to Bethesda and they were removed from GoG and Steam. Fallout, Fallout 2, and Fallout Tactics are once again available on Steam with the price of $9.99.
The games support Steam Cloud saves, Fallout and Fallout 2 have both a classic and default version. The latter offers higher resolutions. Fallout Tactics continues to offer multiplayer via direct connect options. Source Bethblog