IBM Lotus Notes has been around for eons. It's
the groupware application. You can run the Notes client on Windoze and Mac OS (Classic and OS 9), although predictably, the Win client is more fully-featured (Database design and administration in addition to the basic client, Java and COM support, etc.)
More recently (since Lotus Notes 7.x) IBM have added Linux to the list of client platforms on which Lotus Notes runs.
When we refer to 'Notes' we're usually talking about the client, and its applications. 'Domino' refers to the server, and 'Domino applications' are typically databases written in Notes which a web-ready, i.e. coded in such a way that they work OK on the internet (for example, this wiki application is a Domino database).
You can read more about Notes at the Lotus site. There's also a good History of Notes page there.
This wiki, amongst other things, is a storehouse for some of my more unstructured NotesDevelopmentTips documents. You know, the stuff I can't be bothered to work up into whole articles (stuff, that arguably doesn't need to be worked up into full articles). For example:
- The page entitled DominoJava
- The page entitled MovingToSix?