CommonMark, the community standardised fork of markdown, is investigating adding extensible syntax!
miniblog.
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nREPL is a really interesting protocol for developer tools. It's extensible, but one of the basic operations is eval().
If your nREPL server doesn't support a given operation, you can just send an eval request to achieve the same result!
Defining extensible macros, and a helpful approach of classifying syntax into distinct categories:
I'm really excited to learn about Luakit, a browser that's extensible in Lua! https://luakit.github.io/
I've followed uzbl and Conkeror with interest but both are inactive these days.
