Perspective, created by Alan F Slater in the United Kingdom, was originally a free and open source (FOSS) wiki engine. However, its final release, V3, was no longer open source, due to the addition of commercial 3rd party components which no longer complied with open source fundamentals, and therefore became incompatible with open source licensing. V3 did retain one free single-use editor license, whilst multiple user editors required a fee-based commercial license.
Perspective was intended for general usage by on corporate Intranets, and included WYSIWYG editing. Supported Windows Integrated Authentication to provide strong authentication without the need to explicitly log-in. Comprehensive search options including searching over MS Office documents held as attachments in Perspective and within external folders. Other file formats, such as PDFs, can be searched using 3rd party MS IFilters.