Founded in 1981, Interleaf was a company that created computer software products for the technical publishing creation and distribution process. Its initial product was the first commercial document processor that integrated text and graphics editing, producing WYSIWYG ("what you see is what you get") output at near-typeset quality. It also had early products in the document management, electronic publishing, and Web publishing spaces. Interleaf's "Active Documents" functionality, integrated into its text and graphics editing products in the early 1990s, was the first to give document creators programmatic access (via LISP) to virtually all of the document's elements, structures, and software capabilities.
Interleaf was founded by David Boucher and Harry George in 1981. Boucher served as chief executive officer from 1981 until 1992; George served as chief financial officer. Earlier, both were among the founders of Kurzweil Computer Products. Other early personnel came from NBI and Wang Labs. The company initially produced "turnkey" systems, that is, combinations of hardware and software integrated by the company. It initially ran on workstations from Sun Microsystems and Apollo Computers, but later ported its software to workstations made by Digital Equipment Corporation, HP, IBM and SGI, and later still, to the Apple Macintosh II and the IBM Personal Computer.
Interleaf released its first product in 1985. Inspired by the Xerox Star and Apple Lisa, TPS (Technical Publishing Software) uniquely enabled authors to write their text and create technical graphics on a computer screen that showed what the page would look like when formatted and printed on a laser printer. Although modern word processors routinely allow that, at the time this capability was so unusual that the company's name referred to the "interleaving" of text and graphics. TPS was also noted for its ability to handle the sorts of long documents corporate technical publishing departments routinely created.
The company was bought by Broadvision in 2000, which renamed its authoring products "Quicksilver." The availability of Quicksilver 3.0 was announced in March 2007. The availability of QuickSilver 3.5 was announced in May 2010. QuickSilver 3.7 was released in July 2014.
TPS (later renamed to "Interleaf 5," up through "Interleaf 7") was an integrated, networked text-and-graphics document creation system initially designed for technical publishing departments. Versions after its first release in 1984 added instantaneous updating of page numbering and reference numbers through multi-chapter and multi-volumes sets, increased graphics capabilities, automatic index and table of content generation, hyphenation, equations, "microdocuments" that recursively allowed fully functional whole document elements to be embedded in any document, and the ability to program any element of a document (a capability the company called "Active Documents"). Interleaf software was available in many languages including Japanese text layout.
TPS was a structured document editor. That is, it internally treated a document as a set of element classes, each with its own set of properties. Classes might include common document elements such as a body, paragraphs, titles, subheadings, captions, etc. Authors were free to create any set of elements and save them as a reusable template. The properties of a class — its font size, for example — could be changed and automatically applied to every instance of that class. If this caused a change in pagination — increasing the font size could change where the page breaks were — the software would update the screen quickly enough for the author to continue typing, including altering all of the cross-references that the author may have inserted; this WYSIWYG capability was a competitive advantage for the company. The structured nature of the documents also enabled TPS to provide conditional document assembly, a feature that enabled users to "tag" document elements with metadata about them, and then automatically assemble versions of the document based upon those tags. For example, an aircraft manufacturer might tag paragraphs with the model number of the planes to which they applied and then assemble versions of the documentation specific to each model.
Interleaf Relational Document Manager (RDM)
RDM was an early document management product, acquired in the late 1980s and then integrated with Interleaf's other products. RDM used a relational database management system to manage the elements of complex document sets, including their versions. Team of authors and editors would "check in" their documents when done with a work session, and begin a new session by "checking them out." In so doing, RDM would ensure that the authors were working on the most current version of the document, even if another author had worked on it in the interim.
Interleaf Worldview's core functionality is familiar to users of Adobe Acrobat and other Portable Document Format (PDF) viewers, although Worldview preceded it by a year Worldview allowed document sets created with Interleaf's technical publishing tools to be viewed on workstations, Macintoshes, and PCs, retaining page fidelity, and including hyperlinks among the pages
Interleaf WorldView Press
Worldview Press prepared documents for online viewing via Worldview. It imported documents created not only with Interleaf's systems but by the other major document creation and graphic systems of the time, including Microsoft Word, PostScript, TIFF and SGML. Using Interleaf's technical publishing system's ability to reformat documents rapidly, Worldview Press enabled the creation of documents formatted for particular delivery vehicles. For example, the same documents could be formatted for reading on a small laptop screen or for a large workstation's monitor. WorldView Press, developed in Lisp, was conceived and implemented by Jim Giza
As the World Wide Web became increasingly adopted as the preferred mechanism for distributing electronic documents, Interleaf added Cyberleaf, a version of the WorldView Press that produced HTML documents. BYTE Magazine Editors Choice Award in 1995  Bill O'Donnell was the designer and developer of Cyberleaf. Later versions were worked on by Brenda White.
In the electronic distribution area, Adobe Acrobat, launched after Interleaf Worldview, became the dominant software.
- Release 1.0 (PDF), 1988-02-16, p. 11
- English, Paul; Tenneti, Raman (June 1994), Interleaf active documents (PDF), Electronic Publishing, pp. 75–87
- BROADVISION WILL BUY INTERLEAF FOR $851.6 MILLION, EDP Weekly's IT Monitor, 2000-01-31
- Jane Fitz Simon (1998-02-03), "ONE COMPANY ON A ROLL, THE OTHER IN A SKID INTERLEAF, XYVISION BEGAN 7 YEARS AGO; NOW THEIR PATHS HAVE SPLIT", The Boston Globe
- "ELECTRONIC PUBLISHING ON RISE", The New York Times, 1986-10-08
- "45: Interleaf Inc. (one of 50 articles on top 50 independent software companies)", Software Magazine, 1991-06-15
- Company press release
- Company press release
- Worldview was launched in 1992. Interleaf Document Viewer to Span Different Platforms, InfoWorld, 1992-02-03. The first version of Adobe Acrobat was released on June 15, 1993.
- Borzo, Jeanette (3 February 1992). "Interleaf Document Viewer to Span Different Platforms". InfoWorld. Retrieved 13 November 2015.
- Editor (February 1996), Editor's Choice Awards 1996, BYTE Magazine
- Frye, Colleen (May 1994), "Two for document management road - Interleaf Inc and Documentum offer high-end packages", Software Magazine, archived from the original on 2012-07-08
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