Itch.io currently has a "Bundle for Racial Justice and Equality".
It currently has over 1000 items in it (yes, you read that correctly), all for only $5+.
https://itch.io/b/520/bundle-for-racial-justice-and-equality
There are quite a few indie games on it that I've held fire on, because I was interested, but not $10 to $30 NZ interested. They don't supply Steam keys, though, which is a pro or a con depending on which camp you belong in.
(Also includes some non-computer games, e.g. the Lancer tabletop role playing game.)