BlueJ with Modified Error Subsystem is a modified version of BlueJ which has had the error reporting subsystem rewritten to find common programming errors that novice programmers make, report these errors in a descriptive way to reiterate the core concepts of programming, and give advice that the student can follow to fix the problem.
astroPluto is modular Godunov-type code intended mainly for astrophysical applications and high Mach number flows in multiple spatial dimensions. The code embeds different hydrodynamic modules and multiple algorithms to solve the equations describing Newtonian, relativistic, MHD, or relativistic MHD fluids in Cartesian or curvilinear coordinates.
CodeIgniter for PayPal Payments Pro includes every API call available in PayPal's NVP documentation, as well as their Authentication and Permissions APIs. The controller includes "template" methods for every call which include all the possible parameters which can be passed into each particular call. All you have to do is fill the blank parameters in the array templates and pass the results into the library method. An array will be returned with all of the response fields from PayPal, as well as a few extra fields for troubleshooting purposes.