@titania "This Town is Full of Monsters" by Aleks Samoylov worked really well for us as a multiple-session game - it's a game about building up eldritch mysteries
"i'm sorry did you say street magic" by Caro Asercion is a wonderful collaborative worldbuilding game - it's a Microscope hack, if you know that game, but much smaller scope and the rules encourage a more chill, yes-and style of play.
"I Have the High Ground" by Jess Levine is strictly two player, but it's fantastic - you create and then play out the duel of posturing and banter that precedes the duel of weapons, using rock-paper-scissors mechanics to capture the back-and-forth.
"ECH0" by Role Over Play Dead is a heartbreaking little freeform game about the dying ghost of a mech pilot from a long-past war and the children who reunite them with the wreckage of their mech. We played one of the children, and it was super fun and silly until it wasn't - we're tearing up a little, it's very touching.
"Long Distance Camping" by cloverfirefly is a super lighthearted game for remote play by a group of friends - very much a framework for freeform roleplay.
"Wanderhome" by Jay Dragon (we got the itch.io pdf edition in a bundle) is a really wholesome Belonging Outside Belonging game, but in our limited experience you really need to bring some kind of plot to it to make it shine - figure out what the player characters are trying to do, so you have this back-and-forth of gaining tokens through character moments and spending tokens pursuing your group's goals.