If you download an Emacs source tarball, it comes with .elc files so you don't need to byte compile anything.
This enables you to compile the remaining (much smaller) C parts quickly: I've seen installs take under a minute!
miniblog.
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I've seen some programming languages claim to be purely functional, but Coq has taken it to another level.
This hello world tutorial *installs a third party library* so you can do IO! https://coq-blog.clarus.me/tutorial-a-hello-world-in-coq.html
Conda is a delight to use. Proper dependency resolution, fast installs, and MKL builds of numpy by default!
'yarn create foo' automatically installs create-foo, so users don't need globally install the correct tools: https://yarnpkg.com/blog/2017/05/12/introducing-yarn/ (neat!)