BeastMaker lets you create and store a collection of animals using the design sequence found in the Traveller5™ roleplaying game Core Rules.
The app includes a list of worlds which are saved and restored automatically, terrain views for each world, and beast descriptions and animal encounter tables for each terrain/world combo.
Beasts are created randomly based on the characteristics of the world and terrain type according to the rules, but may then be edited within those constraints to customize the design.