I also agree with everybody that being more specific with your goals will help give us direction with our suggestions. A few pieces of equipment that are inexpensive and always good to have are:
1) Ab Wheel
2) Foam Roller
3) Iron Gym (or similar — for pull-ups)
4) Superbands (perform better) or onyx bands (elitefts)
With those items, your own bodyweight, and some creative programming you can achieve a LOT.