Some context, all from wikipedia:

OpenDoc

In March 1992, the historic AIM alliance was launched with OpenDoc as a foundation.Taligent adopted OpenDoc, and promised somewhat similar functionality although based on very different underlying mechanisms. While OpenDoc was still being developed, Apple confused things greatly by suggesting that it should be used by people porting existing software only, and new projects should instead be based on Taligent since that would be the next OS. In 1993, John Sculley called Project Amber (a codename for what would become OpenDoc) a path toward Taligent.[5][6] Taligent was considered the future of the Macintosh, and work on other tools like MacApp was considerably deprioritized.

CyberDog

Cyberdog included email and news readers, a web browser and address book management components, as well as drag and drop FTP. OpenDoc allowed these components to be reused and embedded in other documents by the user. For instance, a "live" Cyberdog web page could be embedded in a presentation program, one of the common demonstrations of OpenDoc.

A serious problem with the OpenDoc project that Cyberdog depended on, was that it was part of a very acrimonious competition between OpenDoc consortium members and Microsoft. The members of the OpenDoc alliance were all trying to obtain traction in a market rapidly being dominated by Microsoft Office and Internet Explorer. At the same time, Microsoft used the synergy between the OS and applications divisions of the company to make it effectively mandatory that developers adopt the competing Microsoft Object Linking and Embedding (OLE) technology. OpenDoc was forced to create an interoperability layer in order to allow developers to use it, and this added a great technical burden to the project.

Kaleida

Kaleida Labs formed in 1991 to produce the multimedia cross-platform Kaleida Media Player and the object oriented scripting language ScriptX that was used to program its behavior. The system was aimed at the production of interactive CD ROM titles, an area of major effort in the early 1990s. When the system was delivered in 1994, it had relatively high system requirements and memory footprint, and lacked a native PowerPC version on the Mac platform. Around the same time, rapid changes in the market, especially the expansion of the World Wide Web and the Java programming language, pushed the interactive CD market into a niche role. The Kaleida platform failed to gain significant traction and the company was closed in 1996.

Taligent

Taligent OS and CommonPoint mirrored the sprawling scope of IBM's complementary Workplace OS, in redundantly overlapping attempts to become the ultimate universal system to unify all of the world's computers and operating systems with a single microkernel. From 1993 to 1996, Taligent was seen as competing with Microsoft Cairo and NeXTSTEP, even though Taligent didn't ship a product until 1995 and Cairo never shipped at all. From 1994 to 1996, Apple floated the Copland operating system project intended to succeed System 7, but never had a modern OS sophisticated enough to run Taligent technology.

In 1995, Apple and HP withdrew from the Taligent partnership, licensed its technology, and left it as a wholly owned subsidiary of IBM. In January 1998, Taligent Inc. was finally dissolved into IBM. Taligent's legacy became the unbundling of CommonPoint's best compiler and application components and converting them into VisualAge C++[5][6] and the globally adopted Java Development Kit 1.1 (especially internationalization).[7]

In 1996, *Apple instead bought NeXT and began synthesizing the classic Mac OS with the NeXTSTEP operating system.*