One that comes to mind is google reader. There were quite a few decent RSS readers out there but then Google Reader came in and took over. Then google dropped it and RSS almost died.
They use the "Embrace, Extend, and Extinguish" line that apparently came out of internal MS emails, but as they say, not quite the same in the Google Reader case: no intent to extinguish presumably -- but the same effect.
Atom, for one. I know everyone here loves VSCode, but the UI in my opinion is terrible. I also don't know how it's faster than Atom for everyone else, I haven't had that experience on any machine yet. I loved Atom, but it's not getting as much support/updates now and the remote-edit package I use every day will occasionally not work at all.
