Otter Research Ltd. (AD Model Builder & MULTIFAN)
This company offers two products: AD Model Builder and
MULTIFAN. The former "is a tool for the rapid development and
implementation of nonlinear statistical models." It is said to
have a number of useful features: derivatives are calculated
without intervention and very efficiently, the Hessian and
covariance matrices are automatically available, etc. Programs,
documentation, and a trial version are available here. The
other product, MULTIFAN, "is used to estimate growth and mortality
for fishes and other species using length frequency data." An
advanced version, MULTIFAN-CL is now available as well.
http://otter-rsch.com/
