Thirukkural
Any of the 1,330 kurals of Thiruvalluvar, in Tamil with its English translation.
About this tool
The Thirukkural has 133 chapters of 10 couplets in three books: virtue, wealth and love.
Developers: this page runs on the Thirukkural API (GET /v1/thirukkural/{number}). Free, open source, no key for most of it.