My logo goes here (eventually), but in the meantime, this seems appropriate:

The following are useful things for calculus. You will need to right click on the links and either Save Link As ... or (for MSIE) Save Target As ...

The Calculus 1 book (PDF format)
Completely revised for the new three-semester sequence in Calculus, and updated for 2019. Size: 2,691,728 bytes.
Zipped version of Calculus 1 book
This is the identical Calculus 1 text, but zipped. It is slightly smaller, so it might download a small amount faster. Note that the Asbury firewall sometimes gets twitchy downloading zip files. Size: 2,508,975 bytes.
The Calculus 2 book (PDF format)
The 2020 version of the book should be up soon. Real soon.
Zipped version of Calculus 2 book
This is the identical calculus 2 text, but zipped for slightly faster downloads, but again, the Asbury firewall can get grumpy about downloading zip files.
Size: 1,387,047 bytes.
The Calculus 3 book (PDF format)
This one is brand new, but as with the Calc 1 and 2 books, pieces were taken from the original Calc I and II books. But there is a whole new chapter, freshly written for this book, and the rest of it has been completely worked over as well. BUT BEWARE! The final chapter still needs some work. An updated version, including more material that will show up in class. This warning will disappear when I am finally happy with the new chapter.
Thanks to Justin, this version has the answers to exercises, plus some corrections I found. Chapter 12 is still not done, and the answers to those exercises are not included, since I haven't written them yet. I encourage you to reload this entire book. Some of the corrections are significant!
Update: This is the current version, as of December 1, 2019. Size = 2,856,246 bytes.
Zipped version of Calculus 3 book
By this point you should get all about the zipped files. That is, this one is also not finished. Size = 2,709,081 bytes
How To Use Sage book
This is a work-in-progress, but it contains plenty of usable information now. It will be updated as I get time to work on it. It is useful for more advanced courses as well.
Sage for Newbies
This is a reasonably understandable Sage guide, also incomplete and by a different person. You might find it helpful also. It tends to be more complete.
Sage for Power Users
This was written by the guy who started Sage, so it is about as authoritative as it gets. But it is not for the casual reader. If you are a computer programmer, though, you will probably find it both useful and interesting.

The following item is for more advanced mathematics, specifically for Dr. Coulliette's upper-level courses. Download instructions are the same.

My LaTeX guide: A Running Introduction to LaTeX
This is useful for getting started with LaTeX, which every mathematician needs to know. Also incomplete, but I am less likely to work on it now.