FlagShip by multisoft is Linux-replacement for Microsoft Foxpro, SCO Foxbase, Borland dBaseIII and CA-Clipper.

FlagShip ...

• is a Multi-Platform Database Development and Porting System, available for Linux, MS-Windows and commercial Unices.
• is easy to use.
• is a highly optimized 4GL language, syntactically compatible to other XBase dialects, like dBase, Clipper, Fox etc. 
• is object oriented, but you don't need any OOP knowledge. 
• supports the same code for DOS (Clipper), Unix/Linux  and MS-Windows. 
• uses the same source code for GUI and textual look and feel.
• allows you to add C sources externally or inline into the prg source; but does not require any C knowledge. 
• produces native executables free of any run-time fees. 

There are different ports of FlagShip for Linux available

Visual FlagShip 7 for kernels 2.6.x and gcc 4.x, using the rpm packager, e.g. for:

• RedHat FedoraCore 3 to 5
• Fedora 6 to 9
• Fedora 10 to 13
• Fedora 14
• RedHat Enterprise RHEL 3 to 6
• Novell/SuSE 8.1 to OpenSuSE 11.x
• Novell/SuSE SLES 9, 10, 11
• Conectiva and Mandrake 8 to 10, Mandriva 2006 to 2010
• CentOS 4 and 5

and others. All above also for 64bit version.

Visual FlagShip 7 for kernels 2.6.x and gcc 4.x, using tar installation (when rpm packager is not available), e.g. for:

• Ubuntu 5 to 10
• Debian 3.x (sarge), 4.x (etch) and 5.x (lenny)
•  Slackware 10 to 13

 and others. All above also for 64bit version.