Windows 3.x

Calmira
Full 16-bit shell, to manage files, launch applications, control tasks. Brings Windows 3.1 up to date with advanced user interface enhancements from Windows 9x world. Written in Delphi, source code available. [Open Source, GNU]
http://www.calmira.de/

Cetus WinGuard
Protect a personal computer running Windows 3.1 from having any of its Program Manager groups or items rearranged or damaged accidentally or intentionally. Automatic setting of any one of seven different protections levels.
http://www.cetussoft.com/winguard.htm

NNTP and AllNews Overview
True Multi-Server NNTP (Usenet) newsreader for Windows 3.x, Windows 95, Windows 98, and Windows NT. Supports SOCKS proxies and decodes yEnc attachments.
http://members.tripod.com/~MikeRead/allnews.htm

Software Page
Several downloads for DOS and Windows 3.x, including Win 3.1 on a floppy (Windows Lite), screen/video/speaker utilities, TCP/IP, resource kit, Win32s.
http://www.geocities.com/old_comps/software.html

win31.de
Windows 3.1x Downloads (utilities, extensions, patches and fixes, multimedia applications, drivers), Links, Tips and Tricks. Includes description of Calmira (Win95 style GUI for WIndows 3.x) and also a summary for Windows NT 3.1 The site is available in English and German.
http://www.win31.de/eindex.htm

Windows 3.1 FAQ
This is a newly developed FAQ for Windows 3.1 that is designed to focus on today's Windows 3.1 issues. Over the past few years, the landscape has changed significantly. Today, most Windows 3.1 machines are older "hand-me-downs", but they still have life left in them. If you have an older 3.1 machine that you are trying to get onto the Internet, this FAQ is for you.
http://www.logicalsky.com/Windows31_FAQ.htm

Windows 3.1 rocks (Yahoo Club)
Discussion forum for Windows 3.1 users
http://groups.yahoo.com/group/windows31rocks/

WinSite - Windows 3.1
Browse categories by subject for Windows 3x files of shareware, freeware and demos.
http://www.winsite.com/win3/