Caldera was a US-based software company founded in 1994 to develop Linux- and DOS-based operating system products.
Caldera, Inc. was a Canopy-funded software company founded in October 1994 and incorporated in January 1995 by former Novell employees Bryan Sparks, Ransom Love and others to develop the Caldera Network Desktop and later create a Linux distribution named OpenLinux. The company was originally based in Provo and later in Orem, Utah, USA.
The later OpenLinux distribution was based on the German LST Power Linux distribution maintained by Stefan Probst's and Ralf Flaxa's company LST Software GmbH (with LST standing for Linux Support Team) in Erlangen, Germany.
Looking for a DOS operating system to bundle with their OpenLinux distribution, Caldera, backed up by The Canopy Group as their largest investor, acquired Novell DOS 7 and other Digital Research assets from Novell on 23 July 1996. The deal consisted of a direct payment of US$400,000 as well as percentual royalties for any revenues derived from DR-DOS to Novell. Caldera filed the Caldera v. Microsoft antitrust law suit the same day.
This lawsuit related to Caldera's claims of monopolization, illegal tying, exclusive dealing, and tortious interference by Microsoft. An example was that certain beta versions of Windows 3.1 produced "non-fatal error" messages when installing and running them on DR DOS 6.0 due to a check known as AARD code.
While active, Caldera, Inc. created a number of subsidiaries:
Caldera UK 
Under the direction of Roger Gross as General Manager of Caldera's Digital Research Systems Group (DSG) the UK-based development center Caldera UK Ltd. ( ) was incorporated on 20 September 1996 to continue the development of the DR-DOS operating system in a converted barn ( ) at the periphery of Andover, Hampshire, UK. Caldera UK developed various DOS-based products including OpenDOS 7.01, DR-DOS 7.02, DR-DOS 7.03 and DR-WebSpyder. Caldera, Inc. closed the Caldera UK Ltd. development office in February 1999 soon after the release of DR-DOS 7.03, thereby effectively stopping any DOS development.
Caldera Deutschland 
Caldera Taiwan 
Caldera, Caldera Systems and Caldera Thin Clients 
On 2 September 1998, Caldera, Inc. announced the creation of two Utah-based wholly owned subsidiaries, Caldera Systems, Inc. and Caldera Thin Clients, Inc., in order to split up tasks and directions.
Under Sparks' lead, the shell company Caldera, Inc. remained responsible for the Caldera v. Microsoft law suit until, after a settlement with Microsoft on 7 January 2000, it ceased to exist.
Caldera Systems, Caldera Holdings, Caldera International, Caldera K.K., and The SCO Group 
Caldera Systems, Inc. (CSI), headed by Love as President and CEO since its incorporation in Orem, Utah, on 21 August 1998, targeted the Linux-based software business including OpenLinux, with Caldera Deutschland as their German Linux development center. The company reincorporated in Delaware on 2 March 2000 and completed an IPO of its common stock.
The company reorganized in August 2000 and became Caldera International, Inc. (CII) in March 2001.
Caldera UK, Caldera Thin Clients, Lineo, and Embedix 
Caldera Thin Clients, Inc. (CTC), incorporated in August 1998 and originally led by Gross as President and CEO, instead developed DOS- and Linux-based thin clients and solutions for embedded systems. Originally located in Orem and later in Lindon, it was meant to become the US-based "parent" company for Caldera UK Ltd., but when Gross resigned and Caldera UK Ltd. was disbanded in February 1999, and when the attempt to relocate the DR-DOS development into the US failed, Caldera Thin Clients under the new lead of Sparks soon refocused on Linux and was renamed into Lineo, Inc. on 20 July 1999, who licensed a stripped down OpenLinux distribution from Caldera Systems and named it Embedix. Lineo continued to maintain the former Caldera sales office in Taipei in 1999. In January 2000, Lineo reincorporated in Delaware.
In July 2002, the company reformed as Embedix, Inc. under the lead of Matt Harris and ceased to exist later that year. Some of the DR-DOS assets fell to the Canopy Group and were acquired by DRDOS, Inc. aka DeviceLogics in 2002. Key parts of the Linux-based Embedix assets were acquired by Motorola's Metrowerks on 17 December 2002.
Caldera (France) 
Totally unrelated to the above mentioned US-based Caldera companies, there is also a French software company named Caldera, specialized in imaging software for wide format digital printing. Created in 1991, it has since got back its trademark from SCO, as well as the caldera.com website. This French company is an award winning company which produces RIP software, as well as other solutions dedicated to digital printers and to the Digital Printing industry.
- Pamela Jones. Now It's Novell v. Canopy. Groklaw Blog, 2004-05-12 (Groklaw - Now It's Novell v. Canopy).
- (Caldera, Inc.'s Memorandum in opposition to defendant's motion for partial Summary Judgment on plaintiff's "Technological Tying" claim).
- Company Data Rex: Basic information about company Caldera (UK) Limited. Company Number 03252883, Record as of 2001-07-01 (CALDERA (UK) LIMITED).
- LST Software GmbH Merges With Caldera Inc. - Critically acclaimed European Linux developers strengthen Caldera's Commitment. PRNewswire, Linux Congress, 23 May 1997 (LST Software GmbH Merges With Caldera Inc. - Free Online Library).
- Caldera establishes Office in Taiwan in response to the embedded market's demand for DR-DOS. PRNewswire, 1 June 1998 (Caldera Establishes Office in Taiwan in Response To The Embedded Market's Demand For DR-DOS - Free Online Library).
- Caldera. Caldera creates two wholly-owned subsidiaries. Press-release, 2 September 1998, PR-Newswire (Caldera Creates Wholly-Owned Subsidiaries).
- Pamela Jones: Caldera, Inc./Caldera Systems, Inc. 1998 Asset Purchase and Sale Agreement. Groklaw Blog, 2004-02-29 (Groklaw - Caldera, Inc./ Caldera Systems, Inc. 1998 Asset Purchase and Sale Agreement).
- Certificate of Incorporation of Caldera Systems, Inc.. 2000-03-02 (Certificate of Incorporation - Caldera Systems Inc.(Mar 02, 2000)).
- Business Editors/High-Tech Writers: Caldera Establishes Japanese Subsidiary -- Caldera K.K. -- With support from Fujitsu and Hitachi., Orem, Utah (BUSINESS WIRE), 31 May 2001 (Caldera Establishes Japanese Subsidiary -- Caldera K.K. -- With Support From Fujitsu and Hitachi. - Free Online Library).
- Graham Lea: Caldera closes UK thin client development unit - Development being moved over to Utah. The Register, 27 April 1999 ().
- Graham Lea: Caldera unveils simple install Linux system - No expertise claimed to be needed for OpenLinux 2.2. The Register, 21 April 1999 ()
- Caldera. Embedded Linux moved to top priority at Lineo, Inc. formerly known as Caldera Thin Clients, Inc.. Caldera, Inc. press-release as of 20 July 1999 (Caldera News Release July 20, 1999).
- (Lineo Is Now Embedix - SD Times: Software Development News).
- Linux Devices: Special Report: Motorola/Metrowerks acquires embedded Linux pioneer Lineo. Linux Devices, 2002-12-17 (SPECIAL REPORT: Motorola/Metrowerks acquires embedded Linux pioneer Lineo - News - Linux for Devices).