C Interfaces and Implementations
Explains the use of various interfaces such as string manipulation and data structure.
http://www.cs.princeton.edu/software/cii/

SederGraphics Interfaces
Offering four interfaces royalty free in Adobe Photoshop 5.5 format, with all original layers.
http://www.sedergraphics.com/

Digital Interfaces Ltd
Manufacturer of Fibre Channel to SCSI bridges and routers for the storage area network (SAN) connectivity of legacy SCSI devices, such as tape libraries, to Fibre Channel.
http://www.digitalinterfacesltd.com

elj database interfaces
The elj project has SmartEiffel interfaces to the following databases: Firebird, MySQL, Postgres, SleepyCat (Berkeley DB).
http://elj.sourceforge.net/projects/db/

Intelligent Interfaces
Andy Ray Developments
http://www.intint.demon.co.uk

Intelligent Interfaces
Andy Ray Developments
http://www.intint.demon.co.uk/

ConTech
Produces a NMEA multiplexer signal extender splitter, marine interfaces and gyro gyrocompass interfaces.
http://www.contechnav.com

GNATS: GNU Bug Tracking System home page
A portable incident/bug report/help request-tracking system which runs on UNIX-like operating systems. It easily handles thousands of problem reports, has been in wide use since the early 90s, and can do most of its operations over e-mail. Several front end interfaces exist, including command line, emacs, and Tcl/Tk interfaces. There are also a number of Web (CGI) interfaces written in scripting languages like Perl and Python.
http://www.gnu.org/software/gnats/

Maryland University HCI Lab
Home Page for the Human-Computer Interaction Lab at the University of Maryland, College Park.
http://www.cs.umd.edu/hcil/

EJBDoclet
The world's largest development and download repository of Open Source code and applications
http://sourceforge.net/projects/ejbdoclet