xBase is a term for programming language derived from dBase which was release in 1980 from Ashton-Tate under CP/M operating system. Hat's off to the people whose responsible for making the Dbf file format and Nantacket for making the compiler to produced a stand alone royalty free executable file.
Some of well known xBase dialects are dBase, Clipper, FoxBase, FoxPro, Visual FoxPro, Paradox, Visual Object, Recital, RBase, Vulcan, FlagShip and there's a lot more out in the wild.
I'll say Goodbye to Visual FoxPro sooner or later which is a discontinued product by Microsoft and I'll will say Hello to the following active xBase dialect listed below:
Xbase++ http://www.alaska-software.com/
dBase+ 11 http://www.dbase.com/
X# https://www.xsharp.info/
xHarbour http://www.xharbour.org/
/3rdParty http://www.fivetechsoft.com/english/index.php
Apollo http://www.apollodb.com/default.asp
Award-winning, embedded database engine for developing Windows applications that manage CA-Clipper and FoxPro 2.6 DBF database files locally or on a shared LAN environment. Includes ADO.NET Data Provider for .NET and native VCL components for Delphi & C++Builder.
Optional database server (Windows only) allows Apollo Embedded applications to connect to CA-Clipper, FoxPro 2.6 and Apollo data files over TCP/IP. Ideal for building client/server applications or for connecting to data files stored on remote servers. Requires Apollo Embedded 9.0 (Sold separately)
