Total Network Inventory: Professional PC audit and network inventory management software - fits best for a for companies of all sizes. Free for 60 days.
Network Inventory Advisor - Network Inventory Advisor audits all network software and hardware simply and efficiently
UCheck - UCheck is a tool that will help you to keep your software updated.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Avira Software Updater - Application that searches updates for software on your computer
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
HEIMDAL FREE - HEIMDAL FREE is an application to automate your device software updates in order to improve your security.