Lazarus is a free cross-platform visual integrated development environment (IDE) for rapid application development (RAD) using the Free Pascal compiler, which supports dialects of Object Pascal, to varying degrees.
License: Open Source
Lazarus is a free and open-source alternative to Delphi, offering cross-platform capabilities and a strong community, while Delphi is a commercial product with advanced features and support. The choice between the two often depends on budget, platform requirements, and desired level of support.