Apps similar to marten include Scratch, which is free and open source. Other options are Blockly, EduBlocks and TheCodePlayer. In total there are four Game Development Tools like marten for Linux, the web, Mac and Windows.
Scratch is a programming language that makes it easy to create your own interactive stories, animations, games, music, and art -- and share your creations on the web. As young people create and share Scratch projects, they learn important mathematical and computational ideas...
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Blockly is a library for building visual programming editors. Users can drag blocks together to build an application. No typing required.
EduBlocks is a visual block based programming tool that will hopefully help teachers to introduce text based programming languages, like Python, to children at an earlier age.
TheCodePlayer is a new concept to make learning front end technologies easier. Code typed is played back like a video with output rendering making conceptual and process based learning butter-easy.
