Great lists so far. I'll add one that I picked up from a previous thread:
URLCheck
URLCheck acts as an amazingly customizable and powerful intermediary when opening url links, allowing, among other things: to remove trackers, affiliate links, unnecessary elements, check Hosts, facilitating link holding and sharing, protecting against certain phishing techniques and many more...
URLcheck has been amazing for me, great for tracking links in apps like Slickdeals (non-FOSS) to skip the tracker especially if you block it on a DNS level