FreeApps is a web site that aggregates free software and lets you download it all from one site. You can choose free software ranging from web browsers, to email and communications, to utilities like anti-virus and firewall. Most of the free software they offer is well known, such as Firefox, AVG, Adobe Reader, and the like, but this site makes it easy to find it all in one spot. It also bundles the software into one file for downloading. There is a very large variety of software available. See below for some of them.
Teachers can use this themselves, but it is also a very good resource to let your students know about so that they can easily find some of this great free software that is out there.