Telegram: encrypted messaging software with a variety of options, including sharable chat folders, personalization options, free open API and source code, available for android, ios, and desktop computers, including computers with Windows, Mac and Linux operating systems and much more.

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Thunderbird: free, easy to use email software with a variety of themes and extensions.

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WinRAR: a file data compression, encryption and archiving tool for Windows, capable of opening, saving and password protecting files as RAR and ZIP files among other compatible file formats.

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Free versatile blogging software designed for bloggers.

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YaCy is a free open-source peer-2-peer decentralized search engine with many options and it's own web crawler.

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Yourls: an open source freeware URL Shortener script with a variety of plugins available.

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Zen Cart: free open source eCommerce shopping cart software with a variety of plug-in's, templates, user forums and much more.

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