9 tools for Goodreads.com, for finding people based on the books they’ve read, finding books popular among the people you follow, following new book reviews, etc
Customize remote websites. This extension injects your Javascript- or CSS-based modifications on every visit. Also supports URL rewriting using regular expressions.
The more and longer wishlists you have, the less you look for buying opportunities arising from price trends. This filters your Amazon lists by (used) price and priority.
Extension to get along with hundreds of scattered browser tabs
Planning a rack enclosure cabinet with network gear using a 3D model, which helps visualize space problems, e.g., in the rear. Also OpenSCAD learning opportunity.
2 scripts for the IRC textmode client Irssi, such as a channel recommender on the basis of aggregated whois-data of other users