borg: managing ~/.emacs.d with git submodules, to facilitate contributing to upstream: https://emacsair.me/2016/05/17/assimilate-emacs-packages-as-git-submodules/ (a definite pain point IME)
miniblog.
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Scuttlebot is a P2P replicating datastore designed to facilitate decentralised applications: https://scuttlebot.io/
The list of available apps is impressive for a young project: https://github.com/ssbc/ssb-handbook/blob/master/applications.md
The apps remind me of IPFS' ambitions, although the protocol is different.