We have an LRF version of the
Summa Theologica here:
https://www.mobileread.com/forums/showthread.php?t=19167
which Deputy-Dawg uploaded a while ago.
The Dominicans who run the New Advent site have posted a 1920 translation of the
Summa Theologica here:
http://www.newadvent.org/summa/
Click on the tabs at the top of the page and you will find
The Catholic Encyclopedia and a lot of writings from the Church Fathers too.
Incidentally, the MR library also has G K Chesterton's biography of St Thomas Aquinas:
LRF:
https://www.mobileread.com/forums/showthread.php?t=19247
PRC:
https://www.mobileread.com/forums/showthread.php?t=19248
IMP:
https://www.mobileread.com/forums/showthread.php?t=19249