Xitami - 2.4d0 

A powerful, multithreaded webserver running on Windows 3.x and Windows 95, Windows NT. Handles hundreds of simultaneous connections easily.

Sambar Server - 4.2 Beta 8 

A multi-threaded HTTP Server with full text search engine, dynamic HTML page generation, server-side MACROs, HTTP,SMTP, POP3 & IMAP4 Proxy services, AD/content filtering via HTTP proxy(implemented via security. c sample application -- source included), built in FTP server (user read/write restrictions by directory), CGI/1.1support (Perl 5 included), SMTP mail APIs (base64 attachments), Built-in Log Analysis (HTTP and FTP logs), HTML-based Systems Management Console.

vqServer - 1.8 

vqServer is a Web server that is designed for the ease of use. It comes with step-by-step instructions and contest-sensitive help. Runs on any platform which supports Java. Supports Java servlets, CGI scripts and password protection of Web pages.