Cross-platform, scientific graphics plotting library
PLplot is a cross-platform, scientific graphics plotting library that supports math symbols and human languages (via UTF-8 user input strings); plot capabilities for multiple non-interactive plot file formats and in multiple interactive environments; and bindings for multiple computer languages.
SIGPROC - a collection of signal processing programs developed for pulsar data reduction has been developed and maintained since 1999. The package is used to search for and visualize the presence of pulsed signals in noisy radio astronomy data.
The Ftcl package allows developers to include Tcl/Tk in their Fortran programs or to create Fortran-based extensions for Tcl/Tk.
NOSE is a package for simulation of linear and non-linear optical and infrared spectra, including absorption, fluorescence, circular dichroism, pump-probe, photon echo and other.
Ordinary Differential Equation (ODE) solver for Tcl. Handles both stiff and non-stiff sets of equations; does time-evolved initial value problems and root finding. Based on the popular Lawrence Livermore solver LSODE.