I do love that you're open sourcing it. A big problem I always had with the Desura launcher, for instance, was how stale it felt. Despite the fact that it made project management much easier than Steamworks, I never felt like it really let me experiment as a developer or businessman. Locking it out of community development (and the bankruptcy drama) certainly didn't help. I would love to see a section specifically for itch.io app mods to automatically install the latest or most popular community-made git commits for the app. We could see some really neat stuff!
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Well, as you say, the beautiful thing about open source is that people don't have to wait for an `extension manager` or whatnot, that would let them code stuff within the boundaries we've carefully chosen... instead they can just fork it, add their favorite feature, then submit a pull request to the main project and hopefully it makes it into the 'blessed' version eventually!
Within a well-maintained project, a feeling of staleness should never happen. But also, we're just a few humans and it's all very early still, so... patience, patience!