Software
Pascal
Pascal is a free and open-source imperative and procedural programming language. The language was designed 1970 by Niklaus Wirth to encourage good programming practices using structured programming and data structuring.
Rebol
Rebol is a lightweight, cross-platform data exchange programming language. The language is designed by Carl Sassenrath and is suited for network communications and distributed computing. Rebol's unique simplistic design makes it a productive language that is loved by its users.
Pharo
Pharo is an open source dynamic and reflective language which is made by a community of more than 100 contributors. The language is isnpired by the programming language Smalltalk which was released back in the 1972. On top of that, Pharo offers several live programming features such as immediate object manipulation, live update and hot recompiling. The Pharo full stack is released under MIT License.
Ceylon
With Ceylon developers can write software that runs on the JVM (Java Virtual Machine) or complied to JavaScript. Ceylon is an object-oriented, strongly statically typed programming language with an emphasis on immutability. The language was first created by Red Hat in 2011, but is now maintained by the Eclipse Foundation.
Objective-C
A general purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. Objective-C was specifically designed for the Apple ecosystem and their respective application programming interfaces, Cocoa and Cocoa Touch for building applications for macOS and iOS. Since 2014 the Apple ecosystem rely on their new programming language Swift.
Racket
Racket started its life as a Scheme implementation, but has now grown into a general-purpose, multi-paradigm programming language and the world's first ecosystem for language-oriented programming. Racket designed to be a platform for programming language design and implementation where developers can create their own dream language.
Lisp
A family of programming languages dating back to 1958. Lisp is the second-oldest high-level programming language in widespread use today.
ReactOS
ReactOS is a free and open-source Windows-like operating system for amd64/i686 computers. ReactOS was designed to be binary-compatible with computer programs and device drivers made for Windows Server 2003 and Microsoft Windows NT family of operating systems including Windows NT4, Windows 2000, Windows XP, Windows 2003, Windows Vista and Windows Seven. To Some, ReactOS is a potential open-source drop-in replacement for Windows and for its information on undocumented Windows APIs