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 - [![Open-Source Software][OSS Icon]](https://scipy.org/stackspec.html#stackspec) [Scipy](https://scipy.org/install.html) - SciPy is a Python-based ecosystem of open-source software for mathematics, science, and engineering.
 - [![Open-Source Software][OSS Icon]](https://github.com/LLK/scratch-flash) [Scratch](https://scratch.mit.edu/) - With Scratch, you can program your own interactive stories, games, and animations — and share your creations with others in the online community.
 - [![Open-Source Software][OSS Icon]](https://sourceforge.net/p/stellarium/code/HEAD/tree/) [Stellarium](http://www.stellarium.org/) - Stellarium is a free open source planetarium for your computer.
-- [![Open-Source Software][OSS Icon]](http://tux4kids.alioth.debian.org/dev.php) [Tux4Kids](http://tux4kids.alioth.debian.org/) - Tux4Kids develops high-quality software for kids, with the goal of combining fun and learning into an irresistible package.
 - [![Open-Source Software][OSS Icon]](https://github.com/ugeneunipro/ugene) [UGENE](http://ugene.net/) - UGENE is free open-source cross-platform integrated GUI-based bioinformatics software.
 
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