Atoms support Renderman, Arnold and Vray renderer. There are procedural for each of these 3 renders that can be used inside maya/houdini or standalone.
In maya with arnodl and renderman is possible to render each agent group as a normal maya node, just lunch a render and the procedural are automatically loaded. But pleas ebe aware the motion blur will not work if you render directly an agent group inside maya.
You must export a cache of your simulation and then use an AtomsProxy node to load it in the scene. The Atoms proxy node support the motion blur.
In Vray just the Atoms Proxy node works. Is not possible to render directly the agent group nodes.
To create agent variations please check the next section