tabbyCalc is a minimalist windows desktop calculator & mathimatical expression evaluator.

With tabbyCalc, you won´t need to use the pitiful default windows calculator ever again! Very simple GUI, nothing over-the-top by design. Just a very functional and powerful calculator! Now with support for 26 (A - Z) variable assignments, many improvements & new features, and dozens of built in functions!

Zipped version with no install also available here.