Update non-free.md

Added E-books and Integrated Library Systems (ILS) section with entry for Ubooquity (https://vaemendis.net/ubooquity/).
5 years ago · 1821cca161
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 ## Decentralized Network

 - [Synereo](https://www.synereo.com/) - Decentralized network system based on blockchain that allows fast speed and great trust level. ([Source Code](https://github.com/synereo/synereo)) `Scala`  
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+## E-books and Integrated Library Systems (ILS)
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+- [Ubooquity](https://vaemendis.net/ubooquity/)  `⊘ Proprietary` - Ubooquity is a free to use, versatile, lightweight, multi-platform, and secure home server for your comic and e-book library. `Java`
 
 ## Federated Identity/Authentication