Open Source Network Servers in C#

Lightweight, extensible socket application framework for . NET. Build command-based servers (FTP, SMTP/POP3/IMAP, SIP, etc.

ASP. NET file upload control that streams uploads to disk and shows progress (InputFile and ProgressBar). Works on Microsoft ASP.

C# port of the Java Email Server (JES) for small installations. Provides an SMTP server component for accepting and processing incoming email with custom logic.

Multi-threaded FTP client/server program written in C#.

SMTP client and server plus POP3 and IMAP4 servers written in C#.

RFC 2518–compliant . NET WebDAV server framework for exposing WebDAV via IIS in custom solutions.