PollyClave
- Multiple-entry identification keys.
- http://prod.library.utoronto.ca/polyclave/

DeltaAccess
- A SQL interface to DELTA, implemented in Microsoft Access 97.
- http://www.bgbm.fu-berlin.de/projects/DeltaAccess/

Lucid
- A system for creating, maintaining, distributing and playing interactive identification keys.
- http://www.lucidcentral.com/

PICKEY
- An interactive multi-entry polychotomous key for identification of organisms by intensive use of images.
- http://www.zin.ru/projects/pickey

TAXIS - Taxonomic Information System
- Database management system for recording taxa, specimens, characters, and images. Also serves as an interactive identification system.
- http://www.bio-tools.net/

PaleoTax
- The program can give an overview of taxonomic and other information of a taxa group. Recorded data can be assessed or exported as RTF or HTML document.
- http://www.paleotax.de

Expert Center for Taxonomic Identification
- The Linnaeus II taxonomic content management system supports creating taxonomic databases, computer aided identification keys, interactive biogeographic maps, and literature and glossary databases in one hyperlinked environment.
- http://www.eti.uva.nl/

ALICE Biodiversity Software
- Database management system for managing data about taxa, species, genera, varieties and cultivars.
- http://ds.dial.pipex.com/town/square/fd95/