Current status: replacing prog2, an emacs lisp special form, with a macro: https://gitlab.com/wilfred/emacs/commit/91967f11ed8a69ea29215e8219cafaef5f550fe2 Unsure if there's interest upstream.
miniblog.
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I like Discord's model of usernames, where I can be wilfred#12345 even if other people have the same name.
Perhaps package managers could do the same thing? It'd save the hassle with name collisions that many systems have. You could also compare download numbers if unsure.
Microsoft have developed the opposite of Wine, a compatibility library for running Linux apps on Windows! (I'm unsure of the target market.)
I like Backbone. There are tons of great online resources and if you're unsure, it doesn't take long to read the relevant source code.