I have two developers I always keep on hand, HC-110 and Rodinal (Blazinal is my local flavour). Between these two there is no common B&W film that you cannot develop.
Other developers I have used, D-76/ID-11 (D-76 is Kodak, ID-11 is Ilford, basically the same thing). These two are great catch-all, cheap, and easy to use film developers. Ilford Ilfosol 3, decent developer if all you're developing is slow Ilford Films. It doesn't really play well with non-ilford stocks I've found.
I have yet to try XTOL, but I do have the packages to mix up a batch.
As for stop...I personally just use water for my stop as I mostly use HC-110 and Rodinal which are both highly diluted developers. I use Ilfostop for D-76/XTOL processing as they're a bit stronger. Fix, is Ilford Rapid Fixer (and Kodafix with hardener for my Adox/Efke films. Another good fixer out there is TF-5 from the Photographer's Formulary.