I was recently talking to another designer and I mentioned the Load-Line calculator I had written for Microsoft Excel. He was very excited and I realized that there are probably many people that would be interested in something like this. So I am making my calculator available to the public!
Right now, I only have the calculator for the 12AX7 completed which I will provide it free of charge. All the other types I will make available for purchase in the near future.
Planned tube types include
Power tubes:
6V6, 6K6, EL84, EL844, 6L6, 5881, EL34, KT66, KT77, KT88, KT120, 6550, 300B
Pre-amp tubes:
12AT7, 12AU7, 6SL7, 6SN7, 6922
Additional types may be written based on demand.
The power tube calculators will calculate power output in SE Class A, PP Class A, AB and B and will have modes for triode wired pentodes as well as standard pentode mode with options for paralleling. The pre-amp tube calculators will also include a sheet for running them as a power tube. (Not currently available with the 12AX7 calculator)
The 12AX7 calculator can be downloaded at the links below:
12AX7 (Excel 2007 1,219kB)
12AX7 (Excel 97-2003 690kB)
*Note: 97-2003 version is beta only. Not fully bug tested*
JDP Amplifiers 
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