Lazarus

Lazarus is a cross-platform IDE for the Free Pascal compiler.

17 Alternatives To Lazarus

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Android Studio

Android development environment based on IntelliJ IDEA

Aptana Studio

The world’s most powerful open-source web development IDE just got better. Rebuilt from the ground-up. It’s now much faster, customizable and includes new features to help you be more productive.

Atom

At GitHub, we’re building the text editor we’ve always wanted: hackable to the core, but approachable on the first day without ever touching a config file. We can’t wait to see what you build with it.

B4X

Cross platform development tools for native iOS, Android, desktop and server applications.

CodeBlocks

Code::Blocks is a free C++ IDE built to meet the most demanding needs of its users.

CodeLite

CodeLite is an open-source, cross platform IDE for the C/C++/PHP and Node.js programming languages.
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Easy code

Easy Code is the visual assembly programming environment made to build 32-bit Windows applications.

KDevelop

KDevelop is a free, open source IDE (Integrated Development Environment) for Linux, Solaris, FreeBSD, Mac OS X and other Unix flavors.
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LiveCode Platform

It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make…

Microsoft Visual Studio

Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.

MonoDevelop

MonoDevelop enables developers to write desktop and web applications on Linux, Windows and Mac OS X.

Netbeans

NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
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PyCharm

Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more…
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Qt Creator

Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.

SharpDevelop

#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft’s .
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Visual Studio Code

Build and debug modern web and cloud applications, by Microsoft
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Xcode

Xcode 4 is the new version of Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.