Just about everyone agrees that the two Emacs packages considered “killer apps” by those considering adopting the editor are Org mode and Magit. I’ve seen several people say they use Emacs mainly for one or the other.
Their development models are completely different. Org has a development team with a lead developer in much the same way that Emacs does. Magit is basically a one man show, although there are plenty of contributors offering pull requests and even fixing bugs. That one man is Jonas Bernoulli (tarsius) who develops Magit full time and earns his living from doing so.
Like most nerds, he hates marketing and would rather be writing code than seeking funding. Still, that thing about earning a living from Magit means that he must occasionally worry about raising money. Now is one such time. Some of his funding pledges have expired and the weakening U.S. dollar is also contributing to his dwindling income.
Virtually every Emacs user is also a Magit user and many of us depend on it so now would be a propitious moment to chip in some money to keep the good times rolling. The best thing, of course, is to get your employer to make a more robust contribution than would be feasible for an individual developer but even if every developer chips in a few dollars (or whatever) we can support tarsius and allow him to continue working on Magit and its associated packages.
His support page is here. Please consider contributing a few dollars. Tarsius certainly deserves it and we’ll be getting our money’s worth.