Here is a list of all the Eberron feats I have designed thus far:
1)Blessed by the Flame
2)Citadel Training
3)Exorcist of the Silver Flame
4)Manifester of the Eldeen Reaches
5)Mograve University Academic
6)Silver Body
7)Silver Pyromancer
8)Sharn Skymage
9)Syrania Manifester

Exorcist of the Silver Flame
Prerequisite: Follower of The Silver Flame, Silver Holy Symbol(see the Knight Templar Background)

With this feat you have joined the ranks of the Exorcists. You gain the following benefits:
•Silver Exorcism. As an action you hold your symbol in the air and start chanting holy words that set it on fire yet you are not burned. You choose an ally who is within 30 feet from you and is under the charmed condition. With Silver Exorcism the target gains advantage on his next saving throw to be set free from possession of dark magic.
•Resist Temptation.You can reroll a saving throw that you failed against charm spells and abilities from Fiends or Undead. If you do so you must use the new roll, and you can't use this feature until you finish a short or a long rest.
•Weapon of the Exorcist. As an exorcist of the Silver Flame you choose a weapon with which you dispense the will of the church. The chosen weapon must be a weapon that you are proficient with, and must have been in your possession for the last 24 hours. While wielding this weapon you treat it as silvered for the purpose of overcoming damage reduction.

Silver Pyromancer
Prerequisite: Light Domain, Follower of the Silver Flame

Casting fire spells tinged with the holy power of the Silver Flame, you as Silver pyromancer gain the following benefits:
•Bow Proficiency: You gain proficiency with the longbow and shortbow.
•Smiting Spell. You ignore the Magic Resistance property of Fiends and Undeads. These creatures roll saving throw without advantage against spells that deal fire or radiant damage. You can do this a number of times equal to your Wisdom modifier (minimum 1). You regain this ability after a Long Rest.
•Silver Flame. Your spells are blessed with the power of the Silver Flame. By chanting sacred hymns, as a bonus action you can substitute any fire spell to deal radiant damage instead.

Blessed by the Flame
Prerequisite: Smite class feature, Lay on Hands class feature, Follower of the Silver Flame

Your devotion to the Silver Flame allows you to burn the Church's foes with holy energies.
• Your lay on hands ability damages Lycanthropes, Fiends and Undead. This damage is radiant and you must succeed a normal melee attack.
• When you roll a 1 or 2 on a damage die for a smite attack, you can reroll that die and must use the new roll, even if the new roll is a 1 or a 2.

Silver Body
Prerequisite: Warforged, Follower of the Silver Flame

Alchemical silver tracery covers your body, allowing you to overcome the supernatural defenses of certain creatures and punishing them for attacking you.
• Increase your Constitution score by 1, to a maximum of 20.
• Your natural weapons deal damage are treated as silvered weapons for the purpose of overcoming damage reduction.
• Any lycanthrope or fiend that bites you takes damage equal to your Constitution modifier. This damage ignores their damage reduction.

Citadel Training
Prerequisite: Breland region, proficient with specific skill

The Citadel Academy in Wroat trains its elite agents well. You gain the following benefits:
• Increase your Dexterity or Wisdom or Charisma score by 1, to a maximum of 20.
• Choose one of the following skills in which you must be already proficient: Insight, Investigate, Perception, Persuasion.The proficiency bonus is doubled for any ability check you make that uses the chosen proficiency.
• When you finish your training  you gain access to certain resources. When abroad you can take refuge in any Brelish embassy or Citadel safe house. (Brelish embassies exist in every recognized capital city in Khorvaire. Citadel safe houses can be found in every large city, metropolis, or capital city, although they are well hidden). You can also tap into a network of Citadel agents, hidden Brelish nationals, and foreign sympathizers and use them as informants or couriers, although finding one in a given settlement requires some searching.

Academic
Prerequisite: proficient with α specific Knowledge skill

You have spent years studying in one of the greatest places of learning in Khovaire. This could be either the Morgrave University in Breland, the Korranberg Library in Zilagro, the Tower of the Twelve in Karnnath, the Arcane Congress in Aundair or the Theology School of Thrane. You gain the following benefits:
• Increase your Intelligence or Wisdom score by 1, to a maximum of 20.
• Choose one of the following skills in which you must be already proficient: Arcana, Nature, Religon, History.The proficiency bonus is doubled for any ability check you make that uses this chosen proficiency.
• As an Academic you have your own room in your chosen institute where you can study or do your research. The doors of the institute are always open for you and you have some status depending your accomplishments. You can also practice your profession as an Academic which gives you a Comfortable lifestyle (PH page 157). You cannot spent any of these money for adventuring or buying equipment.

Sharn Skymage
Prerequisite: Ability to fly either naturally or through magic

•Extend Flight: Whenever a Sharn skymage casts a spell or activate a magic item that allows him to fly, the spell’s duration is doubled.
•Tenacious Flight: Other spellcasters have disadvantage on dispel checks against you when they try to dispel the spell that allows you to fly. If you touch the ground when the dispel takes place the enemy spellcaster rolls without disadvantage.
•Fast Flight: When a Sharn skymage gains or grants the ability to fly by any means (including using a magic item), his (or the spell’s target’s) fly speed increases by 10 feet.

Syrania Manifester
Prerequisite: Sharn Region

You have learned to make use of the manifest zone in Sharn.
•Increase your Strength or Dexterity score by 1, to a maximum of 20.
•When you are within a manifest zone linked to Syrania, including anywhere within the city of Sharn, your jumping distance is doubled and you reduce any falling damage by half.

Manifester of the Eldeen Reaches
Prerequisite: Eldeen Reaches Region

Your years of wandering the Eldeen Reaches have given you a familiarity with its three manifest zones and the powers of the planes they are linked to. Those manifesting zones are: Mabar-the Endless Night, Lamania-The Twilight Forest and Thelanis-the Faerie Court
• Whenever you cast one of the following spells, Conjure Animals, Conjure Elemental, Conjure Fey, Conjure Minor Elementals or Conjure Woodland Beings the duration and the range/area of these spells are doubled.
• Any spell that deals poison damage increases its damage by one more die.
• Any saving throws that rolled against a spell that spreads disease have disadvantage.

 Personally I'd make Citadel Training and Morgrave University Academic into backgrounds. As they are they are very weak feats. 

Blessed by the Flame might be OP at 20th level, for no cost 100 damage

It has a cost, the lay on hands expenditure, but you're right. I'd give it a cap per attack (and possibly a save for half damage? It's not common for things to have both an attack roll and require a save nowadays, but...).

Quote from Shavarathspawn >>

Blessed by the Flame might be OP at 20th level, for no cost 100 damage

 

Quote from Slaine000 >>

 Personally I'd make Citadel Training and Morgrave University Academic into backgrounds. As they are they are very weak feats. 

Quote from Slaine000 >>

Personally I'd make Citadel Training and Morgrave University Academic into backgrounds. As they are they are very weak feats. 

Quote from Shavarathspawn >>

Blessed by the Flame might be OP at 20th level, for no cost 100 damage