Colo2CSS Converting color schemes of Vim to CSS files
Open Source C & C++ IDE for Windows
Minimalist Go package aimed at creating Console User Interfaces
A GUI framework for C# console applications
Regex Windows GUI app to help learn, create,& test Regular Expressions
Free SLOC counts physical lines of code (SLOC) for many languages
All-in-one web-based IDE specialized for machine learning
The smallest header-only GUI library(4 KLOC) for all platforms
A small C library for building user interfaces with C, XML and CSS
Dynamic Extension for TCL/TK
A simple, friendly framework for Free Pascal text mode GUI creation.
Free texture packer
OpenNum lets you distribute solvers with a nice graphical interface
A web UI client for managing git repos on the go
iOS Automation Framework iOS Touch Simulation Library
Object Oriented Language
Python bindings for the Chromium Embedded Framework (CEF)
Marathon supports testing of Java/Swing and Java/Fx applications.
Garnet Common Lisp GUI Library
Light & Dark Vim color schemes inspired by Google's Material Design
Build cross platform HTML desktop apps on .NET
Make yourself a GUI for DOS from QBasic