The following are some recommended external websites with helpful textual resources.
Pali and other Theravada Books in Sinhala, Pali Roman script etc.
Theravada Buddhist Wikipedia
Pure Theravada Buddhism Exposed according to The Original Pali Canon
METTANET - LANKA is devoted to Tipitaka and other Theravada texts in Sinhala, Pali Roman script and translations (under ven. Mettavihari)
Access to insight - Readings in Theravada Buddhism
Karuṇā Sevena is a group associated and supporting Ven. Visuddhi from the Czech Republic.