When you log onto your corporate intranet, you may not realize how much of what you see if powered by IBM. They sell a lot of big software packages that cost gobs of money and are often used across an entire corporation, so perhaps you weren't in the position to make the purchasing decision. For example, tons of companies used Lotus Notes for email (now Connections), there are loads of Websphere Portal software add-ons, and they're really into business process management and collaboration software these days (Facebook and Dropbox and wikis and whatnot across the organization).

http://www-01.ibm.com/software/