r80v5 - a small (7kb) fully featured webserver written in REBOL, including support for embedded server-side REBOL scripts - http://vpavlu.plain.at/plain-dev/r80v5/r80v5.html
Coyote File Transfer System - Coyote is a powerful replication system that offers secure data transfer that traverses specified ports in your firewall, and does not expose your sites to the known dangers of using NetBios and FTP. Built with REBOL. - http://compkarori.com/coyote/index.html
The MakeDoc Standardization Project - MakeDoc is a text formatting program for easily producing HTML and other types of document output. The goal of this project is to develop a standard input format for MakeDoc but keep it as simple as possible. - http://www.rebol.net/docs/makedoc/
XFT - A combined server/client application that allows you to set up a shared directory on your PC to share files across the internet. - http://www.compkarori.com/xft/
A List Apart: Simple Content Management - How to build a complete, expandable, client-side content management system using REBOL. - http://www.alistapart.com/stories/simplecontentmanagement/
VanillaSBX - VanillaSite-out-of-the-Box (SBX) is an easy to install Vanilla package for Windows computers. - http://www.langreiter.com/space/VanillaSBX
Vanilla - a simple, extensible hypertext system and framework for developing small-scale web applications written in REBOL. - http://www.vanillasite.at/
rebXR - A full client/server XML-RPC implementation for REBOL. - http://earl.strain.at/space/rebXR
RBML - REBOL Markup Language is a markup language used to generate dynamic web-content. - http://schuhr.com/rbml/
make-doc-pro - a portable, easy-to-edit format for all kind of documents - the program converts a simple text formatted file into HTML or other document formats (such as PDF or REBOL/View) - http://robertmuench.de/projects/mdp/
CitrusWeb - A web application framework for developing web sites and web applications, including content editing and configuration via a web interface - http://www.marmaladefoo.com/docs/software/citrusweb