MySQL Workbench is a cross-platform, graphical database modeling tool for MySQL. It allows you to create database models from scratch as well as by importing existing databases from SQL or DBDesigner4 models. You can then generate SQL code to CREATE databases, ALTER them, and export in various image formats and PDF/PS. Its extension system allows writing plugins and scripts in Lua, Python, and C++.
wyoGuide is a tutorial, a collection of guidelines for building cross-platform applications with a well-designed, consistent look and feel. It gives ideas and advice on how an application and its GUI could and should be written. Development with these guidelines gives the GUI of an application a standard set of base functionality. wyoGuide also provides sample code for each guideline written in C++ using the wxWidgets (formerly wxWindows) framework. For a seasoned developer it shouldn't be difficult to adapt these guidelines to other languages or frameworks.
GetDP is a general finite element solver using mixed elements to discretize de Rham-type complexes in one, two, and three dimensions. The main feature of GetDP is the closeness between the input data defining discrete problems (written by the user in ASCII data files) and the symbolic mathematical expressions of these problems.
nomacs is an image viewer that is small, fast, and able to handle the most common image formats including RAW images. It also makes it possible to synchronize multiple viewers on a single computer or via the LAN, which is useful for comparing images and spotting the differences. This is useful for architects who want to see their progress, for example.