Splat! is a wonderful utility to compute antenna coverage and path loss between two antennas. It is written in C for Linux/Posix systems.
Considering this, I have endeavored to write a webapp which will serve as a front-end for Splat!. It will allow one to submit a job, and retrieve the results of that job sometime later (it can take as much as 20 minutes to run a coverage analysis).
I started out trying it in C# using Mono on Linux/FreeBSD, but I just like Java better, so I have abandoned that in favor of a JSF webapp.
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Splats online
I've added "splatting" to my repeater project. Here's an example:
http://k5ehx.net/repeaters/qrepeater.php?tag=TRO88SYSTEM&overlays=Y
Any repeater that has a receive antenna height is scheduled for analysis. It's not perfect, but it's somewhat useful. Longley - Rice would be better, of course, but that takes more CPU than I have readily available.