Integrated software for developing cross-platform applications 
The WINDEV, WEBDEV and WINDEV Mobile environments are compatible and share project elements. It has never been easier to build multi-target applications.
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HFSQL  is a database engine included in the development environments (WINDEV, WINDEV Mobile and WEBDEV). 

HFSQL operates with Windows  and  Linux , with  Mobile devices , with networks of any size and any type, and it automatically manages concurrent accesses.HFSQL: Free, Unlimited DatabaseSeveral version of HFSQL are available: local, network, Client/Server (Windows and Linux), Cluster, Mobile, Embedded. 

HFSQL is very powerful, very fast and very reliable.
HFSQL has already been deployed on millions of sites worldwide. 

The HFSQL engine can be  freely distributed  with your applications developed with WINDEV, WEBDEV and WINDEV Mobile.

  Read the HFSQL technical documentation
  Read the technical documentation PDF