Why wouldn’t you consider Obsidian FOSS? It seems like the source code is available. I’m relatively new to open source and not trying to argue, just think that there’s a distinction that I’m missing.

Having used it for a bit, it feels more like a Notion alternative than an Obsidian competitor. For instance, it isn’t based on Markdown and pages aren’t directly accessible on the OS filesystem (there’s some sort of pseudo-cloud storage thing going on). Its Sets and Collections feel like a different take on Notion’s databases. Some of the default examples loaded into the app are a task tracker and a movie list, two things I use Notion for right now. I’m sure there’s some feature overlap with Obsidian, but that doesn’t seem like Anytype’s primary goal.