gCAD3D is a 3D CAD-CAM application which features an integrated 3D OpenGL viewer, a program interpreter for geometry and NC-commands in 3D, and a programming interface for user programs. It has support for importing Step files and support for both importing and exporting Iges, DXF, and VRML files.
gxInstall is a software installer for Linux. It allows you to create installation packages that are self-extracting, support multiple languages, support uninstallation, create menu items and a desktop icon, and have an overhead size of only 50 kb. It has GUI (GTK 2) support, and is completely script-based, flexible, and easy to use. It does not use RPM, pkg, etc.