However, I'm not sure how well maintained it is. I fear all the time that the author, jps, has quit, but then every few months he has a development sprint and releases a new version.
I'd rather have it permanently called "beta" but a minor update every month, than one version declared finished, with rare or no updates afterwards.
I actually even use its fuzzy search to search my harddrive sometimes. Because I haven't found an easy app for Linux that works like Search Everything on Windows.
In that vein though, see also Synapse: https://launchpad.net/synapse-project
Textmate is still in development and has a good few releases a year. Last commit was a month ago but I think Allan likes to work a few months then have a few off.
wbond is the author of Package Control for ST and I think he lurks here sometime.
I disagree. The name is the developer's way of telling you whether the software should be considered ready for general use. As long as it's called "beta", I'm not going to second guess the developer's judgement; I'll wait until the release version of ST3 before upgrading from ST2.