Opera:

MoonID - Monsters Game & others
KnightFight BG Server 1
Dungeons & Treasures

Language courses:

Mondly
Duolingo
Memrise
Lingualeo
Firefox:

Nodiatis
Tanoth BG
Tanoth UK
Tanoth US
BiteFight BG S2
BiteFight BG S8
Eternal Duel
BC Wars
Dream World
Time World

Tank Force: Real Tank War Online

Gladiatus.com S10 (8)
Gladiatus.com S15 (12)
Gladiatus S2 (1)
Gladiatus BG S2
Iron (Facebook games):

Zombie Slayer
Warzone: Armageddon

Dragons of the Void
Castle Age
War Commander
Battle Pirates
Mars Frontier
Days of Valor
Dream World
PlayGem
Backgammon Live

My Wall
Sasha's Wall
Mecho's Wall
All Requests