VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode