Here is the list of the Season 3 of the Fourth Doctor Adventures from Big Finish. And Tom Baker just keeps on going!
3.1 - The King of Sontar 
3.2 - White Ghosts
3.3 - The Crooked Man
3.4 - The Evil One
3.5 - Last of the Colophon
3.6 - Destroy the Infinite
3.7 - The Abandoned
3.8 - Zygon Hunt