This is a list of software that I find to be useful. For the category, see Useful Software.
Audio
Editing
Playing
Backup
Compression
Database
Documents
Comparing
Editing
Viewing
Email
Emulation
Encryption
File Transfer
Graphics
Hex Editor
Network Maintenance
Optical Discs
Burning
Emulating
Imaging
Playing
Ripping
PC Maintenance
Programming
Remote Management
System Utilities
Video
Downloading
Editing
Viewing
Web Browser