The DAS/1 Protocol
The original version 1 specification, written by Lincoln Stein and Robin Dowell, is the basis for a number of clients and servers. More than 200 DAS/1 servers are currently running worldwide including WormBase, FlyBase, Ensembl, TIGR, and UCSC.
The DAS/1 specification is currently available in version 1.53 from http://www.biodas.org/documents/spec.html
a list of DAS/1 clients here
How to set up a DAS/1 server
Publishing and Discovery of DAS/1 sources
For a listing of all available DAS sources please proceed to http://www.dasregistry.org