An online collection of 101 level tours of programming languages. If you have to get up to speed in a hurry, you might find something useful in here. Has overviews of common tools, also!
The Internet free music archive. Just what it says on the tin.
The Internet Archive has the complete run of the comic book UFO available for download.
A personal storage server for storing blobs of data. Basically a dumptruck for posts, files, and whatnot. Search, brows, and visualize. Can be mounted as a file system using FUSE. Can back up socnet data. CLI and web UI.
Github repo: https://github.com/perkeep/perkeep
Software that makes a local archival copy of web pages sent to it via a number of means. If you can get URLs into an RSS feed, or you plug it into your browser or bookmark manager (like Shaarli) it'll mirror the page, save a PDF copy and a screenshot, and then throw it to the Wayback Machine. Can be run as a cronjob. You can even give it an HTML page full of links. Can use Chrome Headless to log into websites. Archives can also be exported for publication.
Formerly Bookmark Archiver.
Homepage of the PLA. Fun stuff, here!