Software that may be useful for

- differential equations:
xmds - An open-source XML based simulation package, of ordinary differential equations (ODEs) and partial differential Equations (PDEs).

scipy's collection of dynamical systems programs.

fenics Fenics is free software for automated solution of differential equations. It is separated into components, and already has a python interface (dolfin).

- Databases/tables:
- Notebook Editing
It's All Text - a Firefox plug-in which will launch the editor of your choice with the contents of a text box. Perfect for Wiki editing and working in the notebook

Python Quick Reference - The ultimate Python resource. Grab the single page version and save locally (its pretty big)