As no one has replied so far, I'll risk to suggest something which might not fit exactly what you're looking for... (after all, you specifically asked for CPAN modules)

Anyhow, to me it sounds like you might benefit from using an existing job queuing system for the backend, and then only develop some web frontend to your liking. There are commercial solutions like LSF¹, but I suspect you might be more interested in open source software, so you might want to take a look at Sun Grid Engine, which provides a similar feature set.

Both systems might seem like overkill for what you appear to be in need of. On the other hand, no one forces you to deploy a world wide grid of computing resources. You can just as well configure a mini "cluster" of, let's say, 1-3 machines, and still take advantage of the extremely flexible queuing, load balancing, resource management and monitoring facilities etc., that such tools provide.

Before you approach the docs, however, it might help to install a filter (in your head) to mask out all the enterprise level blurb you're likely to encounter ;)

There also is a Perl binding to talk to the queuing backend via DRMAA (Distributed Resource Managment Application API), but I cannot say much more than this, as I've never used the module myself.

Hope this helps, and good luck!
Almut

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¹  Disclaimer: I'm in no way affiliated with Platform Computing Inc., the producer of LSF. I just happen to have had some exposure to the software at work.