In development software, libraries, toolkits, gui's etc, what licenses do I need to look for that will allow me to sell products created using the software?
Edit: I should've said also that I'm most interested in licenses for free development tools, however, not necessarily open source.
The BSD license allows you to do this; the GPL generally does not. There are a wide variety of other "open source" licenses with various restrictions, but those two are commonly used.
The Open Source Initiative maintains a list of open source licenses.
Simplified, the main licenses are:
BSD: You can use the code.
LGPL: You can use the code, and changes to the code must be released.
GPL: You must release your code.
Mind you, none of these licenses prevent you from selling your product. It's just the GPL would require you to give the source code to anybody you sold the product to.
The Apache license is also common, like BSD allows you to create closed source proprietary derivatives. Some notable users are Google (android) and of course, Apache.
I certainly know of the Ms-PL (Microsoft Permissive License) but you can find a pretty good list at the CodeProject license page. The first part of the page is for uploading articles to the site but it still has a good list of licenses and their restrictions.
I'll state what's been too obvious to state so far: non-OSS products will mostly not restrict you in terms of products developed using them. That's what you bought them for, after all.
The restrictions would be in terms of redistributing their libraries, and even then, a certain level of redistribution rights will likely be permitted.