As I can't have a fully functional system with Linux at the moment (till I convince my partner to allow a second tower in the house or I get around to buying an EeePC) I've had to settle with a few Open Source apps that I can run on Windows. I've downloaded a couple so far these are Open Office (OOo as it's referred to) and Pidgin. Of course there are many more Open Source apps out there but I've only gotten around to these two so far.
Open Office is similar to Microsoft Office, it has all the usual apps such as word processing, Spreadsheets, Database, PowerPoint and Drawing. The great thing about OOo is it works in the same way as the Microsoft version so it's simple to use you don't have to relearn everything, also you can open Microsoft documents with it and vice versa, it's compatible with most systems so you don't have to worry about converting files if you use OOo at home and Microsoft at work. The best thing about OOo compared to Microsoft is that it's FREE!!
Pidgin is a chat client that allows you to send instant messages using many existing clients so if you have more than one account you can bring them altogether using this one app. Pidgin works with these IM clients..........
Both Open Office and Pidgin come already preinstalled with Linux OS so although I can't have the full version at the moment at least I can still have a taste of Open Source on Windows.