Animal Trajectory Analysis (trajr)
A toolbox to assist with statistical analysis of 2-dimensional animal trajectories. It provides simple access to algorithms for calculating and assessing a variety of characteristics such as speed and acceleration, as well as multiple measures of straightness or tortuosity. Turchin (1998, ISBN:0878938478).

A Tool for the Visualization of Vowel Variation (visvow)
Visualizes vowel variation in f0, F1, F2, F3 and duration.