HEXelon MAX - HEXelon MAX is a science calculator. It solves math expressions like: Sin(Pi)-Root(-8;3)+3.
Jim - An overview of Jim capabilities
Console Calculator - Console Calculator is a powerful calculator with a simple console interface.
Insect - High precision scientific calculator with full support for physical units.
SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
errProof - The website has a lot of useful and unique tools.