Development

Ben Poole
Weblog, articles and tips related to Lotus Notes/Domino application development.
http://www.benpoole.com

Codestore
Daily Weblog and collection of articles, tips and sample applications for developing Domino web applications.
http://www.codestore.net

Domino Guru
Weblog, articles and tips for developers on Lotus Domino and related technologies.
http://www.dominoguru.com

IBM Redbooks Home Page
IBM redbooks related to Lotus Notes and Domino are available here for download as Adobe Acrobat PDF files.
http://publib-b.boulder.ibm.com/redbooks.nsf/portals/Lotus

Johan Känngård
Weblog and articles for developers on Lotus Domino, Java, LotusScript and web.
http://dev.kanngard.net

MadJunk
Lotus Domino Administration articles, tips, and topic discussions.
http://www.madjunk.com

Martin Scott Consulting
Domino SuperSearch. Search 30+ Notes/Domino technical knowledgebases at once. Notes code library and technical whitepapers.
http://www.martinscott.com/

NotesDesign
Development tips and techniques, information, downloadable example databases, and links to related sites.
http://www.notesdesign.com/

OpenNTF
Provides applications for Lotus Notes as open source, which may be freely distributed.
http://www.openntf.org

TeamStudio
Provides a series of tools for Notes/Domino development. Company information and downloads.
http://www.teamstudio.com/