What are some alternatives?
When comparing Extra Keys and Event Viewer, you can also consider the following products
Holdkey - Holdkey is a Windows program that makes it easy to type characters with accents.
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 .
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.
Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
Gucharmap - Open source character map for the GNOME desktop environment.
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.