Google Cobalt

High-performance platform that implements a subset of HTML5/CSS/JS

Chromely

Chromely is a lightweight alternative to Electron.NET, Electron for .NET/.NET Core developers.

Proton

Compatibility tool for Steam Play based on Wine and additional components

Qt

C++

Ultimate++

Ultimate++ is a C++ cross-platform rapid application development framework

azula

Lightweight GPU accelerated HTML GUI for native JavaScript applications.

fman

An unexpected gift. January 07, 2018 by Michael. One of the nice things that happened last week was an fman user writing in to say that 1) fman “is THE BEST SOFTWARE” (sic).