BeeFree.io - Bee is MailUp's drag-&-drop editor for responsive design emails.
Ruffle - An open source Flash player
Topol.io - Create professional Email templates easily - Drag & Drop Email Builder.
BlueMaxima's Flashpoint - the webgame preservation project.
MJML - The open source framework for responsive emails
CheerpX for Flash - its adobe flash player in webassembly