KiCAD has a large user base and active development. It may be buggy, but you will find they all are, to varying (never unnoticeable) degrees. Difference is, they're actually interested in fixing them. (If you find too many bothersome bugs in the stable branch, try the nightly builds.)
After that, I would suggest Circuit Maker/Studio (I don't know the difference..), or EAGLE (which is not free anymore, but it's not like it's hard to find downloads of the free version).
There's a number of vendor-locked and web-based ones too, but I wouldn't recommend getting into that habit.
Tim
-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website:
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Had a look on ebay and cheapest is PCBCAD51 for £4-99. Seems to do a lot for the money.
A mate suggested KI-CAD which I had a quick look at. While it has excellent libraries their website suggested latest versions haven't been debugged fully yet.
I had a brief encounter with Easy-PC many years ago but that is like £400 ish now.