Org Mode - Organize Your Life In Plain Text!
Making events reoccur by cloning: A blog post about an alternative to the repeater functionality built into Org. I think I like this idea in the Org context much more than I would in, say, gcal: as long as the data is easy to manipulate, who cares if there are a bunch of copies. The reason this wouldn't work in gcal is that gcal doesn't provide the tools to edit events en masse directly, so there needs to be a very expressive system for specifying repeaters up-front. Org does make it easy to edit events en masse directly, so it's less of a problem.
Org-cite (intro blog) is the builtin package that defines the standard Org citation syntax. It's mainly important to me for exporting citations from Org syntax. It also provides some bibliography frontend stuff, but Citar is nicer.
Citar is a package for conveniently interacting with bibliographies: filtering, selecting, and running commands against bibliographic entries. It provides a completing-read frontend as well as a CAPF.
See Balintona's writeup for details.