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Numi App - Numi is a beautiful text calculator for Mac.
WinCompose - WinCompose supports the standard Compose file format.
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 .
PopChar - The character map that works!
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
AllChars - If you're new to AllChars: start with the Introduction, see the FAQ and Manual. And finally download it. AllChars is now Open Source, usage is free and the sourcecode is available.