And like yeah, both the wonderful (and foss!) .json5 and Microsoft’s semi-proprietary(?) .jsonc exist, but most projects just use their language’s default JSON parser that doesn’t recognize them. What I would personally love to see is .json5 support baked into the default JSON parsing libraries of Python, Go, etc. (Enabled by a flag, likely.) It’s a superset of regular JSON and fully ES2019 compatible, so there shouldn’t be any issues.

I would add PairDrop to your list to have bookmarked. It’s completely web-based so no download required and thus fully cross-platform. It also works across different networks (i.e. over the internet) by pairing devices or creating a room. Basically Apple AirDrop, but universal and on steroids.