I can't think of anything, but Twitter is responsible for a lot of major projects out there.
Bootstrap comes to mind - and while that's not something I foresee them "selling", a company large enough to produce a F/OSS project of that size and complexity surely has any number of large, mature products that they could sell or monetize.
Also, the key part of the LBO playbook isn't making quick cash from selling off assets - it's divesting the company of cost centers and investing heavily in profit centers. If you're able to sell the things that aren't making you money, all the better.