A brief history of OWL and OWLNext. For more details, visit the Object Windows Library article on Wikipedia.
Development by Borland
1991 - OWL 1.0
Borland C++ 3.0 includes Turbo Vision for developing DOS GUI applications and OWL for developing Windows GUI applications.
For handling windows messages uses Dynamic Dispatch Virtual Tables (DDVT), a non-portable Borland extension to C++
1994 - OWL 2.0
Borland C++ 4.0 is released. It includes OWL 2.0, which replaces the DDVT with RESPONSE_TABLE, a macro based mechanism, which is maintained today. A conversion tool (OWLCVT) was included to migrate code from OWL1.0 to OWL2.0.
1995 - OWL 2.5
Borland C++ 4.5 with OWL 2.5 is launched. Also included is the Object Component Framework (OCF) to ease OLE development.
1996 - OWL 5.0
In 1996 Borland launched Borland C++ 5 for Windows, which included OWL 5, which was a major revamp of the library.
In 1997, Borland dropped development of OWL in favor of the Visual Component Library (VCL), introduced in Delphi.
1998 - OWL NExt 6.0
In 1998 a group of developers lead by Yura Bidus started the project of maintaining the OWL library. The original name was OWL NExt, where NExt meaning was New Extensions. Later was joined to OWLNExt and now actually is called OWLNext.
OWL NExt uses STL, with emulation classes for the old BIDS containers, to ease porting of legacy OWL projects.
1999 - OWL NExt 6.04
OWL 6.0 patch 4, released in 1999, was considered the base version until the release of OWLNext 6.20. All updates were distributed as patches to 6.04.
2000 - OWL NExt 6.10
Version 6.10 is released in 2000.
2001 - moving to SourceForge
In 2001 the project is moved to SourceForge and the domain owlnext.org is registered.
2003 - OCF Next 6.16
An upgrade to OCF, compatible with OWL Next is released as OCFNext 6.16
2007 - OWLNext 6.20
After a series of release candidates, OWLNext 6.20 is considered ready and is included on C++ Builder 2007 Partner CD.
The version naming is changed - odd-numbered versions will be under development, which, when considered finished, will become an official release with an even number.
Work starts on development version 6.21 with the goals of removing 16-bit compatibility code and changing the names of the libraries and dlls to avoid version and compiler conflicts.
2009 - OWLNext 6.30
Development version 6.21 becomes the official 6.30 release, and work starts on development version 6.31.
2010 - C++ Builder XE
OWLNext 6.30 is included in C++ Builder XE Partner DVD
2011 - OWLNext 6.32
Development version 6.31 becomes the official 6.32 release, included in Embarcadero C++ Builder XE2, and work starts on development version 6.33.