The technology behind balloon powered internet and project Loon
Krita is a free and open-source raster graphics editor written in Qt and designed primarily for digital painting
Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. It is a free
LibreOffice is a powerful, free and open-source office suite, a project of ‘The Document Foundation’, a non-profit organization that promotes open source document handling softwares.