Bluestone, Inc.
 - Unix Development tools including GUI, Object Oriented, Database and Client/Server application development. 
Cobra Systems, Inc.
 - Bar Code Printing for Unix!  Print from Any Application or Program, i.e. RPG, COBOL, C/C++, etc.  To any Dot Matrix or Laser Printer! 
Dakota Software, Inc.
 - Custom software development Windows, MS/DOS, Unix  
Dataviews X-Designer 4
 - a full line of graphical software tools for developers of the human-computer interface. 
DIOSS
 - Gives the developer all the tools he/she needs to create and distribute applications. 
Franz Inc.
 - The developer of several ANSI-standard Common Lisp Object System (CLOS) programming tools for Unix and PC platforms. 
hav.Software
 - C++ class libraries for Backpropagation and SOM Neural Nets (PC & UNIX) demos. 
ILOG, Inc.
 - Advanced C++ Software Components which are high performance, portable and cost-effective. 
Imagix Corporation
 - Program understanding and documentation tools for complex/legacy C and C++. 
Inmark Development Corp.
 - Simplifies creating Grapical User Interface applications that are portable across the most popular operating systems. 
Integrated Computer Solutions
 - Offers tools which make it easier and faster to develop mission-critical applications. 
IPT Corporation
 - A fully-integrated Product Development organization an also provide software development tools for UNIX, VMS, and MS-Windows. 
KL Group
 - Premier supplier of low-cost Graphical User Interface (GUI) software objects for the X community. 
Latitude Group, Inc.
 - Developes cross-platform development tools and software that allow Macintosh programs to run on a variety of platforms. 
LOOX Software
 -  The software developement solution to interactive graphics for your GUI. 
Metro Link
 - third-party provider of X-Window System software for UNIX or UNIX-like operating systems. 
Microport
 - Unix, Unixware, device drivers, total net, totalnet, web servers, unix support. 
Mortice Kern Systems Inc.
 - We're a leading-edge software company specializing in application development tools, software configuration management, open systems and Internet communications.  (Unix compression utilites)
Presentation Graphics SDK, The
 - A professional business charting library for Macintosh, Power Macintosh, Windows, Windows NT, Windows 95, OS/2 and UNIX. 
TakeFive Software
 - A programming environment for UNIX developers working with C, C++ and other languages. 
Trident Systems Incorporated
 - Stop writing design documents.  Generate them.  SDDGen lets you focus on capturing your design ideas, not writing documents.  It's all X, multi-user, and costs less than $1,200. 
UniPress Software - Development Tools
 - Unix application development tools. 
UNIBOL
 -  software development and execution environments for the UNIX operating system. 
Wind/U
 - The Bristol Technology family of Wind/U products offers developers compatibility between Microsoft Windows and UNIX/Motif. 
Visual Numerics
 - Provider of powerful numerics, graphics, data analysis, and charting solutions. 
X Inside Incorporated
 - UNIX X Server graphical developers, offering highest performance and reliability.  OpenGL, PEX, Multimedia (MPEG, XVideo, etc) drivers are available or can be developed.