VHackOS farm bot
This bot basically automated the game so that I never had to login again but still held a spot on the leaderboard.
It also made a database of valuable targets, I shared this bot and database of targets with my in-game clan called FSC at the time.
The game was a glorified hacker themed cookie clicker, I could not resist making a bot for it and actually my very first bots I ever made in PHP targeted a previous version of this game years before this one.