I'm a NetBeans fan and unless the customer explicitly prohibits this IDE, I always try to evangelize the developers working with me and switch to NetBeans. Lately, we've been developing a custom user registry and some login modules to plug into WebSphere Application Server: I definitely needed to link to WebSphere libraries.
To ease the switch to NetBeans from Rational Software Architect, I defined the library in my NetBeans and then distributed the definition of the NetBeans library, which simply is an XML file.
As you can see in this screenshot, the required libraries to work with WAS 6.1 are a good number and find themselves in a bunch of different WAS installation directories. In this case, I'm using the libraries of the WebSphere Application Server which is bundled with Rational Software Architect v. 7.0.
To distribute this definition to your fellow developers, you can just give them the library definition which you can find in the following directory (modulo NetBeans version number):
Since this library has been labeled WAS-6.1, the file name is WAS-6.1.xml.
The structure of such file is pretty intuitive, as you can see from this excerpt:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE library PUBLIC "-//NetBeans//DTD Library Declaration 1.0//EN" "http://www.netbeans.org/dtds/library-declaration-1_0.dtd">
Should you need it, you can process it with a program, or even with grep and sed, and batch-apply any change you'd need. For example, since my development platform of choice is Solaris whilst my client's is Windows, I frequently have to modify such files to adjust the library paths.
I'm now developing flawlessly in NetBeans and deploying our applications, or even our plugin modules, on WebSphere Application Server. NetBeans hasn't any plugin, as far as I know, to produce IBM-specific deployment descriptors but we're not experiencing any problems: we just apply deployment customization using WAS' excellent administration console.