The Families in British India Society (FIBIS) is an organization which helps members research their British India family history.

They have some online collections for Sri Lanka (formerly Ceylon).

 
[su_heading size=”18″]Online Collections[/su_heading]

• Ceylon Images
• Monumental Inscriptions from Cemeteries in Ceylon (now Sri Lanka)
  • Colombo Cemetery Image Index
  • Tombstones and Monuments in Ceylon by J. Penry Lewis, C.M.G.
  • Nuwara Elya Cemetery

Fibis has a Wiki with helpful links for Sri Lanka family history research including digitized historical books about Sri Lanka (Ceylon).