Xamarin Studio Alternatives for Mac OS X

Eclipse is a powerful, open-source Integrated Development Environment (IDE) widely used for Java development, but also supporting a variety of other programming languages through its extensive plugin ecosystem. It provides a robust set of tools for coding, debugging, testing, and deployment.

NetBeans is a free and open-source Integrated Development Environment (IDE) specifically designed for enterprise-level Java development, supporting a wide array of other languages and technologies, including PHP, C++, JavaScript, HTML, and CSS. It provides comprehensive tools for coding, debugging, testing, and deploying applications.

Aptana Studio was a robust, open-source integrated development environment (IDE) specifically designed for web development. It provided developers with a comprehensive set of tools and features to build web applications efficiently, supporting various web technologies like HTML, CSS, JavaScript, PHP, and Python.

Xcode is Apple's integrated development environment (IDE) for macOS, providing a comprehensive suite of tools for building applications for all Apple platforms, including macOS, iOS, watchOS, and tvOS. It offers powerful features like code completion, debugging tools, and a visual interface builder.

Lazarus is a powerful, free, and open-source visual IDE for rapid application development with Free Pascal. It provides a Delphi-like experience for creating cross-platform native applications across various operating systems.

PyCharm is a powerful, cross-platform Integrated Development Environment (IDE) specifically designed for Python developers. It offers intelligent coding assistance, a wide range of developer tools, and deep integration with various development workflows, making it ideal for everything from small scripts to large-scale web applications.

PhoneGap, powered by Apache Cordova, is a popular open-source mobile development framework enabling developers to build cross-platform mobile applications using standard web technologies like HTML, CSS, and JavaScript.

CodeLite is a free, open-source, and cross-platform Integrated Development Environment (IDE) designed specifically for C, C++, PHP, and JavaScript (Node.js) development. It provides a feature-rich environment to streamline the coding process for these languages.

Qt Creator is a powerful, cross-platform Integrated Development Environment (IDE) tailored for building applications with the Qt framework. It supports C++, QML, and JavaScript, offering a comprehensive suite of tools for designing UIs, writing code, debugging, and deploying software across various platforms.

Apache Cordova is an open-source mobile application development framework that allows developers to build cross-platform mobile apps using standard web technologies like HTML, CSS, and JavaScript. It acts as a wrapper around web content, providing access to native device features through plugins, enabling the deployment of a single codebase across multiple mobile platforms like Android and iOS.

Nvu is a discontinued, open-source WYSIWYG HTML editor. Based on the Mozilla Application Suite's Composer component, it provided a simple visual interface for creating web pages without needing extensive coding knowledge. It was a popular choice for beginners and non-programmers for basic website creation.

Projucer is a powerful IDE and project management tool for C++ developers, particularly those working with the JUCE framework. It simplifies the creation, management, and deployment of cross-platform audio and plugin applications.

Appcelerator Titanium is a powerful open-source framework designed for building native mobile applications from a single JavaScript codebase. It enables developers to leverage their existing web development skills to create high-performance, truly native user experiences across iOS and Android devices.

Editra is a robust, cross-platform text editor designed with developers in mind. It's open-source, highly customizable through plugins, and features essential tools for coding like syntax highlighting, code completion, and an embedded terminal.

kodeWeave is a versatile, portable HTML/CSS/JavaScript playground and IDE. It allows developers to write, test, and debug web code directly within the application, offering features like live preview, syntax highlighting, and support for various frameworks.