Peace be with you!
St. Thomas Aquinas is a Doctor of the Church. He is still world famous in Catholic and non-Catholic circles for his contributions to philosophy. He is arguably most famous for his Summa Theologiae.
The complete works of St. Thomas Aquinas can be found at the following addresses:
In Latin: http://www.corpusthomisticum.org/iopera.html
In English: http://dhspriory.org/thomas/
In French, Portuguese, German, Spanish, English, and Latin: http://www.documentacatholicaomnia.eu/20_50_1225-1274-_Thomas_Aquinas,_Sanctus.html
Hyperlinked Summa Theologiae in English: http://www.newadvent.org/summa/