Vim
Well, this is a small disaster. Bram Moolenaar, the main developer of Vim, has been hired at Google, which is good for Google, good for Bram, but bad for Vim. It looks like Vim 7 will be the last new Vim for a good while, if the project continues at all.
I hope someone steps up to take over full time development, though, as this is one of open source’s most valuable projects. It would demonstrate the ability of OSS software to continue after a project’s patriarch leaves.