The first public release of Curve Captor project is out on SourceForge.
Curve Captor can build Spice-compatible models from the traced tube data (either from datasheet curves or obtained elsewhere) and do bias and loadline calculations, as well as simple waveform analysis for common gain stages. Generated non-linear models are macro-based and easily adaptable to various flavors of Spice, and are sophisticated enough to give realistic distortion figures. Simple GUI and high computational speed assist rapid development cycle.
Why version 0.9? Well, I have been using it for nearly four years for my vacuum tube projects, so the code is fairly mature. I have done some rework of the code for this release, and it could use a wider testing ground, so I still consider it beta. Stable release 1.0 will follow once enough user reports come in.