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 best suited for developers looking for a powerful open-source solution for complex desktop applications, leveraging Pascal. In contrast, B4X offers a more user-friendly environment focused on mobile app development, with built-in analytics and cloud integration features.