From Introduction:
This PDF is meant to expand what a character with the Ability to rage can do. There are four ways that Rage feats expand the Ability to rage. Rage feats may add a benefit to the character while raging, allow a character to gain a different ability from the standard Ability to rage, allow a character an additional benefit while already raging to gain additional benefits or even allow a character to place magical abilities upon their weapons while they are raging.
This PDF contains 66 new feats usable by anyone with the Rage or Whirling Frenzy ability. It also contains 3 feats exclusively for the variant Whirling Frenzy Ability to rage (see Appendix A for information on Whirling Frenzy). In addition, there are 10 feats for the variant Totem Barbarian (see Appendix B for Information on Totem Barbarians).