Boku wa tomadachi ga sukonai
campione!
Clannad
Elemental Gelade
Final Approach
Fortune Arterial
Freezing
Hentai Ouji to Warawanai Neko(Henneko for short)
Hoshizora e Kakaru Hashi
Ichiban Ushiro no Daimaou
Itsuka Tenma no Kuro Usagi
Kanon(2006)
Kaichou no maid-sama
Kiss x Sis
Kimi ga Nozumo Eien
Lamune
Lovely Complex
Mashiro-Iro Symphony: The Color of Lovers
Myself; Yourself
Mysterious Girlfriend X
Nogizaka Haruka no Himitsu
Omamori Himari
Ore no Kanojo to Osananajimi ga Shuraba Sugiru
Rosario to Vampire
Sakurasou no Pet na Kanojo
Seto no Hanayome
Shakugan No Shana
Shuffle!
Suki-tte ii na yo!
To Love-Ru
Toradora
Tonari no Kaibutsu-kun
True Tears
Vampire Knight
Zero No tsukaima


Seeing as you didn't list any that you have seen, i just took the majority of the Romance that i have seen. Hopefully you find some use of this list!