QCAD - QCAD: 2D CAD
https://qcad.orgVerkkoQCAD is a free, open source application for computer aided drafting (CAD) in two dimensions (2D). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or …
LibreCAD - Free Open Source 2D CAD
librecad.orgJetBrains has generously supplied us with CLion licenses for the development of LibreCAD. This powerful IDE helps you develop in C and C++ on Linux, OS X and Windows, enhancing your productivity with a smart editor, code quality assurance, automated refactoring, and deep integration with CMake build system.