DeviceLogics, Inc.  
   Makes DR-DOS, compact, Y2K safe, perfect for embedded or thin-client systems; source code available; development kits, older and localized versions; Breadbox Ensemble; NetWare.
   http://www.drdos.com/

Unofficial DR-DOS Resources  
   Links, install and use tips, FAQ; mail lists, newsgroups, fora; downloads: images, source code; tools.
   http://www.drdos.net/

OpenDOS Stuff  
   News, FAQ and mail archives.
   http://www.delorie.com/opendos/

Club DR-DOS  
   Unofficial page with FAQ, news/information, mirrors, bug reports, support, history, binary file for private use, links to DOS programs, documentation library, German links.
   http://stud3.tuwien.ac.at/~e0225895/drdos/

The DR-DOS/OpenDOS Enhancement Project  
   Goal: continue development, enhance abilities of, add support for new standards to, extend life of this DOS under open source license. Descriptions, downloads of latest versions: source code, binaries, patches.
   http://www.drdosprojects.de/

OpenDOS Unofficial Page  
   Descriptions, Q&A, downloads, mail lists, programming information. Not up-to-date, but has useful information, some of historical interest.
   http://www.deltasoft.com/opendos.htm

DR-DOS Forum by DrDOS.Ws  
   Active message board for users and programmers.
   http://senac.com/forums/4356/