There are countless! Not to get into any graphics handling libraries here, but once the DelphiX project became inactive and Hori went silent people started making their own solutions. There at one time was Omega, XCESS, UnDelphiX, PowerDraw (add-on for DelphiX and independ and library) which is now Asphyre, SX Media components for DelphiX, WDirectX, the DirectX headers got more popular and of course many others...

But it all started with DelphiX. Thats why it's so popular even today.