itch.io

Contains lesbian, gay, bisexual, and/or transgender characters or plot lines. Expanded to include queer, intersex and agender identities.

Focused on an interpersonal relationship or set of relationships between characters (and frequently, the player).

Focused on using its text, moreso than its visuals or audio, to tell the bulk of its story/plot. (Still can have great audio and visuals, though!)