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Nextcloud server is a free and open source server software that allows you to store all of your data in a server of your choosing. With Nextcloud you can easily access and store data in the data center you trust, sync data among various devices, and share your data for collaboration purposes. It offers the best security in the self hosted file sync and share world, and is expandable with hundreds of apps.
WhiteBear is a set of foundation classes for database engines written in Java. It supports object and relational database, is highly portable and may be used in embedded or server environment. Project has been created from scratch and plan to includes storage engine, server, SQL interpreter, ODBC, JDBC and JDO interface
This is the first data protocol layer open source in the blockchain
By providing SDK for data exchange through blockchain, developers can more conveniently develop DAPP applications.
It mainly includes the following contents:data encryption and decryption, digital signature, smart contract, event notification, data storage interface, data acquisition and query, digital currency payment, the third-party App payment interface, etc.