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Objective-C is an object-oriented programming language created by Brad Cox and Tom Love in 1984. It is primarily used for macOS and iOS application development, particularly before the adoption of Swift. Developers can access Objective-C by installing Xcode from the official Apple website at Xcode Downloads, which includes the Objective-C compiler, libraries, and documentation for macOS and iOS development.

Smalltalk, short for Smalltalk Programming Language, is an object-oriented, dynamically typed programming language known for its simplicity, uniform object model, and live development environment. It is widely used in education, research, and software prototyping, and has influenced modern languages such as Java, Python, and Ruby.

Vala, short for Vala Programming Language, is an object-oriented programming language that targets the GNOME platform, designed to bring modern programming features such as classes, interfaces, and generics while compiling to C code. It is primarily used for application development on Linux desktops and GNOME-based systems. Developers can install Vala via package managers such as apt, dnf, or Homebrew, and official documentation and resources are available at the GNOME Vala project page.

X++, short for X++ Programming Language, is an object-oriented, event-driven language used primarily for business application development within Microsoft Dynamics 365 Finance and Operations (formerly Dynamics AX). It is designed to integrate tightly with the Dynamics platform, allowing developers to customize, extend, and automate enterprise workflows, data models, and forms. Developers can access X++ through the Microsoft Visual Studio-based development environment included with Dynamics 365 and compile code directly into the application server.

Xojo, short for Xojo Development Platform, is a cross-platform rapid application development environment and programming language used to build desktop, web, mobile, and console applications from a single codebase. It is commonly used for business software, internal tools, utilities, and cross-platform applications targeting Windows, macOS, Linux, the web, iOS, and Raspberry Pi.