ZX Play
ZX Play is a ZX Spectrum emulator & programming environment for the browser. Read more about this project here.
Source code is available here on GitHub and released under the GPLv3 license.
Retired Products
Nimatron
Nimatron is a Nim programming language plug-in for IntelliJ Platform IDEs.
Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula.
nim-lang.org
Source code for this plug-in is available here on GitHub and released under the GPLV2 license.