These would all have requirements of a single past life of a class (or more if listed) and cost a feat slot (fighter feats would be able to purchase fighter PL feats, wizard slots those...., as well as any general slot being able to be used to purchase the feats).

Artificer

  • Rune Arm Prof: You may use rune arms. Your level for rune arm abilities equals your total level plus any modifiers to your caster level.
  • Tinker: You gain +2 to your UMD checks. Additionally all magical items you use have a +1 Caster Level and +1 to the DC's of their abilities.
  • Alchemical Knowledge: You gain an additional 20% more effectiveness from any infusion used on you. For example, a corrosive weapons spell cast on your weapons deals 1d6 + 1d6*0x2 extra acid damage per hit instead of 1d6.
Barbarian

  • Barbarian Spirit (Requires 2 Barb PL): You may take barbarian levels regardless of your alignment. This feat may be purchased at first level and allows you to take levels of barbarian at the level you are purchasing it at. Additionally you gain 1 extra Rage/Day.
  • Zerger: You zerg like a true barbarian gaining 10% run speed.
  • Memories of Rage(requires 3 Barb PL): You gain +1 Str and +1 Con for each 'rage' effect active on you including the rage spell, barbarian rage, and madstone rage (among others). You gain this feat for free at barbarian level 20 if you have 3 barbarian PL.
Bard

  • Entrancing Influence: You gain the permenant effects of Melodic Guard.
  • Songs of the Ancestors (requires 3 bard PL): Your songs are 20% more effective then normal in all respects including duration, DC's, and modifiers.
  • Echoes of Song: You gain an additional 20% bonus from any bard songs that are effecting you.
  • Bloodline of Song (requires 2 Bard PL): See barb feat barbarian spirit except this feat refers to bard.
Figher

  • Weapon Specialization: As normal weapon specialization, but available to any class that has PL fighter.
  • Greater Weapon Specialization (requires 2 Fighter PL): see weapon spec.
Monk

  • Calm Soul: (requires 2 Monk PL): see barbarian spirit except this refers to monk.
  • Improved Zen Archery: You now gain ki with ranged attacks. Additionally, you gain a bonus to your damage with bows equal to 1/4 your wisdom modifier.
Ranger

  • Whirling Dervish (requires 3 ranger PL): You gain 1d6 extra untyped damage per hit while twf.
  • Dedicated Hunter of XXX: You gain an additional FE. This FE adds to the effectiveness of all your other FE as it counts as a FE. Additionally against this specific FE you gain +2 to hit and damage.
Rogue

  • Soul of the Assassin (requires 2 rogue PL): You gain 10% fort bypass. Additionally you do 1 extra sneak attack damage per hit.
  • Quick on your Feet (requires 3 rogue PL): You gain the effects of the feat: evasion.
Paladin

  • Soul of Grace (requires 2 pali PL): See barbarian spirit except this refers to pali.
  • Blessed Weapons: Your weapons gain the modifier Rightousness in addtion to any other effect on them. This feat is aquired for free if you have any paladin levels (on a TR with a paladin PL).
  • Scourge of Evil (requires 3 pali PL): Your weapons gain the effects of the pure good modifier in addition to any other effects they might have. You gain this feat for free at paladin level 12 if you have 3 paladin PL.
Cleric

  • Attuned to Positive Energy: You gain 10% healing amp. If in undead form you instead no longer suffer damge from positive energy and may be healed by it at -75% rate. If you are a warforged you instead no longer have any penalty to healing by positive energy.
  • Master of Healing: Your healing spells and effects heal 10% more hit points then normal and empower healing costs 1 less SP per use.
FvS

  • Favored by the Divine (requires 3 FvS PL): You count as a three level higher FvS, cleric, and paladin for purposes of granted class abilities, excluding any spell casting abilites, and requirements to purchase enhancements as long as you have at least one level of the class.
  • In the thick of things: You gain +3 to your concentration checks or +10 to concentration checks when using a healing spell. This feat is granted for free at level of FvS if they have a FvS PL.
Wizard

  • Master of Metamagics (requires 2 wizard PL): Your metamagic feats cost one less SP to use.
  • Memories of Arcane Lore (requires 3 wizard PL): At the time of this feats purchase you must pick one arcane spell level 1-3. You may now use this spell as follows for free at a caster level equal to your total character level once every minute for a first level spell, once every two minutes for a second level spell, and once every three minutes for a third level spell. These spells may be modified by any metamagic feats you have for free.
Sorc

  • Elemental Mastery: Your acid, fire, cold, or electric types spells are caster level +2.