There are many alternatives to Lazarus for Linux if you are looking for a replacement. The best Linux alternative is Qt Creator. It's not free, so if you're looking for a free alternative, you could try CodeTyphon or Ultimate++. If that doesn't suit you, our users have ranked more than 25 alternatives to Lazarus and 12 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Lazarus are Xojo, Ecere SDK, Cevelop and LiveCode.
Qt Creator is a cross-platform integrated development environment (IDE) built for the maximum developer experience. Qt Creator runs on Windows, Linux, and macOS desktop operating systems and allows developers to create software across desktop, mobile, and embedded platforms.
CodeTyphon is a fork/distribution of Lazarus with thousands of Lazarus/Free Pascal components bundled into distribution and with own Lazarus expansion features.
Ultimate++, also called U++, is a C++ cross-platform rapid application development framework focused on programmers productivity. It includes a set of libraries (GUI, SQL, etc..), and an integrated development environment.
Real Software and Real Studio are now Xojo. Create your own apps, like commercial or in house apps, games, utilities and more with Xojo! This object-oriented multi-platform development tool enables ordinary people to create extraordinary apps for the Desktop, Web, Console, and...
Enables development of cross-platform applications from a single codebase with minimal modification, offering native deployment on Windows, Mac, Linux, web browsers, servers, and mobile devices, with both open-source and proprietary licensing options for royalty-free distribution.
It's a cross between Glade / Visual Studio — the idea is that most 'action' code for an application is actually quite simple - so entering the code on the event handlers for a widget makes the proximity of code to action better.
XVT is a software development environment for building cross-platform GUI applications in C or C++. XVT allows developers to graphically lay out an application's GUI, and provides cross-platform libraries to aid development.
MaxBlox is a complete application development platform. The entire system is web-based and allows the ability to build applications that operate over the web. This is architected as a Platform as a Service (PaaS) system.
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Lazarus has a complete gui toolkit and many libs. GNU Pascal is just a compiler.