Atria Software Inc. was a software company that developed

ClearCase Rational ClearCase is a family of computer software tools that supports software configuration management (SCM) of source code and other software development assets. It also supports design-data management of electronic design artifacts, thus enab ...

in the early 1990s. It was founded by David B Leblang, Paul Levine, David Jabs and others on January 11, 1990. Some of the Atria developers had worked on an earlier system: ''DSEE'' (

Domain Domain may refer to: Mathematics *Domain of a function, the set of input values for which the (total) function is defined **Domain of definition of a partial function **Natural domain of a partial function **Domain of holomorphy of a function * Do ...

Software Engineering Environment) from

Apollo Computer Apollo Computer Inc., founded in 1980 in Chelmsford, Massachusetts, by William Poduska (a founder of Prime Computer) and others, developed and produced Apollo/Domain workstations in the 1980s. Along with Symbolics and Sun Microsystems, Apollo wa ...

. After

Hewlett-Packard The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( ) or HP, was an American multinational information technology company headquartered in Palo Alto, California. HP developed and provided a wide variety of hardware components ...

bought

in 1989, they left to form Atria. Atria later merged with

Pure Software Pure Software was founded in October 1991 by Reed Hastings, Raymond Peck and Mark Box. The original product was a debugging tool for Unix/C engineers called Purify. After adding new products such as Quantify and PureLink, and doubling its reven ...

to form Pure Atria. That firm merged with

Rational Software Rational Machines is an enterprise founded by Paul Levy and Mike Devlin in 1981 to provide tools to expand the use of modern software engineering practices, particularly explicit modular architecture and iterative development. It changed its ...

, which was purchased by IBM in 2003. IBM continues to develop and market ClearCase.

References

Software companies based in Massachusetts Software companies of the United States {{tech-company-stub