Object+
Object+ is an IT consultancy and project management company in the area of exchange related business like clearing, trading and risk management.
http://www.objectplus.nl

Enhancing Object-Based System Composition through Per-Object Mixins
The paper introduces per-object mixins as a new object-level language construct for object-based system composition. Per-object mixins are implemented in the scripting language XOTCL as a straightforward extension of its method chaining mechanism and enables the developer to mix classes into the precedence order of an arbitrary object.
http://wwwi.wu-wien.ac.at/~uzdun/publications/xotcl-mixin.pdf

Object Management Group (OMG)
Object computing industry consortium that defines standards including UML, CORBA and IIOP.
http://www.omg.org/

Webstructor World
Distributed visual knowledge editor
http://www.webstructor.net/

A Brief Tutorial on CORBA
By Kate Keahey. A short introduction to The Object Management Group's Common Object Request Broker Architecture (CORBA).
http://www.sunderland.ac.uk/~ts0jti/corba-web/corba1/tuto.html

The Technology and Business of ObjectStore
Detailed two-part history of Object Design, maker of object-oriented database management system ObjectStore.
http://dlweinreb.wordpress.com/2007/12/31/the-technology-and-business-of-objectstore/

4Suite XML Tools
A collection of Python tools for XML processing and object database management: they handle XML parsing, XPath expressions, XPointer, XSLT transformations, XLink, RDF and ODMG object databases. [Open Source, BSD-like]
http://4suite.org/

Object Primer
The Application Developer's Guide to Object-Orientation. An introduction to object-oriented analysis and design techniques. By Scott W. Ambler, SIGS Books.
http://www.ambysoft.com/theObjectPrimer.html

F-Script Home
Smalltalk-based pure object-oriented environment to work with Mac OS X software. Innovations: high-level model for object manipulation, powerful object browser. Developed from scratch for the Objective-C object model. Highly integrated with Cocoa, native access optimized. Descriptions, news, documents, downloads.
http://www.fscript.org/

Object Management Group
Distributed object computing industry standards group founded in 1989. Defined standards include CORBA and IIOP.
http://www.omg.org/