Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Fing - Discover which devices are connected to any Wi-Fi network, map devices, detect intruders, assess...
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode