Buncha sales on GoG for Disney owned stuff (including Star Wars). SW Battlefront II has also been updated by GoG so that it's mulitplayer should work properly on modern computers (this also effects the Steam version but that's not on sale).
Feels like a lot of free games are being given out over the past year. I know Humble Bundle got acquired by IGN and may be selling off your data to third parties which may explain them. With the others though, I can't tell if it's just coincidence. Not seeing much urge for me to even buy from Steam or GoG when i have a backlog and can just patiently wait for something I what to be temporary free.