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| | Free DELTA |
 | | The DELTA system consists of a flexible format for coding descriptive taxonomic information and a set of associated programs which manipulate the data to produce natural-language descriptions and keys, interactive identification and information retrieval, and to convert data into formats required by programs for phenetic and cladistic analysis. |
 | | DELTA format allows all kinds of characters, both qualitative (binary or multistate, ordered or unordered) or quantitative (integer or real, with units if needed). |
 | | Large datasets have already been prepared with DELTA, for flowering plant families, grasses, sedges, legumes, beetles (adults and larvae), ants, corals, plant viruses, etc. Several of these datasets incorporate line, gray-scale and color illustrations, and some were made freely available on the Internet, along with the full DELTA software package itself. |
| freedelta.sourceforge.net (1512 words) |
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