Welcome to Lazarus Lazarus is a Rapid Application Development tool for Free Pascal and currently runs on Linux, Mac OS X, BSD and of course Windows. It is freely available, open source and completely written in Free Pascal. The official Lazarus site is https://www.lazarus-ide.org/. There is a wiki with a lot of information around Lazarus at http://wiki.lazarus.freepascal.org/. Free Pascal can be found at https://www.freepascal.org/. The Lazarus Component Library is licensed under a modified GNU Lesser General Public License. The Lazarus IDE is licensed under the GNU General Public License. Free Pascal online documentation. RTL - Free Pascal Run Time Library FCL - Free Component Library LCL - Lazarus Component Library ### Offline help Many help files are available for download in chm and inf format. Viewer for chm files: see Installing CHM help in the IDE Viewer for inf files: see DocView IDE Integration.