These are all simple tools I made with Scheme during my three week programming course this summer. Notice that I said beginner's, because to many of you, these are unbelievably simple. I just hope I can help someone.

Scheme is a programming language to help you learn other programming languages, thus it is the best to start with (so my instructor told me.)
You will need DrScheme:
Code:
http://download.plt-scheme.org/drscheme/plt-4-2-5-bin-i386-win32-exe.html
to use these source codes. I just found out that DrScheme has been renamed to Racket, and is no longer updated. However, this version still is great for learning.

After downloading and installing DrScheme, change the programming language on the bottom to RSR5.

Download the source codes here:
Code:
http://uppit.com/ixsin1xii9m0/Scheme.rar
Now, you can use these source codes. Click the .ss files to select one.

The names are pretty self explanatory, so have fun.
Includes:
Code:
*99 Bottles of Beer Singer (sings 99 bottles of beer with however many bottles of beer you want to start with)
*Average (Mean) calculator
*Cube Root Calculator
*Exponent Calculator
*Factorial Calculator
*Fibinaci Sequence Calculator
The last 5 files are all parts of a square root calculator. The first one is a code that determines if a guess for the square root is good enough. The second one improves the guess.
4th and 5th calculate square roots. The third one, figure out yourself :p.
I hope this was helpful.
Good luck!