Once I listed books on Algebra and Related Mathematics in this article, Since then I was recieving emails for few more related articles. Here I’ve tried to list almost all freely available Calculus texts. Here we go:

1. Elementary Calculus : An approach using infinitesimals by H. J. Keisler
2. Multivariable Calculus by Jim Herod and George Cain
3. Calculus by Gilbert Strang for MIT OPEN COURSE WARE
4. Calculus Bible by G S Gill [I found this link broken.]
5. Another Calculus Bible by Neveln
6. Lecture Notes for Applied Calculus [pdf] by Karl Heinz Dovermann
7. A Summary of Calculus [pdf] by Karl Heinz Dovermann
8. First Year Calculus Notes by Paul Garrett
9. The Calculus of Functions of Several Variables by Professor Dan Sloughter
10. Difference Equations to Differential Equations : An Introduction to Calculus by Professor Dan Sloughter
11. Visual Calculus by Lawrence S. Husch
12. A Problem Text in Advanced Calculus by John Erdman
13. Understanding Calculus by Faraz Hussain
14. Advanced Calculus [pdf] by Lynn Loomio and Schlomo Sternberg
15. The Calculus Wikibook [pdf] on Wiki Media
16. Stewart ‘s Calculus by James Stewert.
    [Link removed due to copyright reasons.]
17. Vector Calculus
18. The Calculus for Engineers by John Perry
19. Calculus Unlimited by J E Marsden & A Weinstein
20. Advanced Calculus by E B Wilson
21. Differential and Integral Calculus by Daniel A Murray
22. Elements of the Differential and Integral Calculus[pdf] by W A Granville & P F Smith
23. Calculus by Raja Almukkahal, Victor Cifarelli, Chun Tuk Fan & L Jarvis