<p>What options do I have to publish Flash video from webcams other than Adobe's Flash Media Server and Red5? I would prefer a solution in .NET, Python or PHP but can't find anything.</p>

Besides another commercial product, like
Wowza Media Server
, you could go with a CDN (Content Delivery Network), like
Limelight Networks
or
Voxel.net
.  You might even be able to find a local hosting provider that would serve up live Flash video for you.
(Live Flash video in a non-trivial thing to do, so the options are a bit limited.)