ODATA 云驱动 http://www.cdata.com/cloud/ 目前支持：ORACLE、MS SQL 、 MYSQL。
rssbus http://www.rssbus.com/ 数据格式转换（交换）的软件系统，FREE！
--------------
DATADIRECT CLOUD https://www.progress.com/products/datadirect-cloud
Cloud Drivers
Makes on-premise & cloud data sources easily accessible across platforms and devices.
Expose live data from internal and external facing web applications, mobile apps, ETL tools, and popular desktop applications.
- Make data easily accessible to Web, desktop, and mobile clients.
- Access data through simple standards-based interfaces like ODATA, REST, HTML, RSS, ATOM, JSON, SOAP, CSV.