Open Source C Proxy Servers

UFTP is an encrypted multicast file transfer program, designed to securely, reliably, and efficiently transfer files to multiple receivers simultaneously. This is useful for distributing large files to a large number of receivers, and is especially useful for data distribution over a satellite link (with two way communication), where the inherent delay makes any TCP based communication highly inefficient. The multicast encryption scheme is based on TLS with extensions to allow multiple receivers to share a common key. UFTP also has the capability to communicate over disjoint networks separated by one or more firewalls (NAT traversal) and without full end-to-end multicast capability (multicast tunneling) through the use of a UFTP proxy server. These proxies also provide scalability by aggregating responses from a group of receivers.

RELIANOID is an open core (Debian GNU/Linux based) Application Delivery Controller (ADC) with advanced load balancing features such as Network Load Balancer, Application Load Balancer with SSL offloading, Advance Network Configuration including Virtual Interfaces, VLANs, Bonding with link aggregation, IPv4/IPv6, advanced routing, stateless cluster, web GUI, JSON API and much more! Enterprise Edition Load Balancer is available with extra features such as global service load balancing (gslb), application security including web application firewall (WAF), blacklists, Realtime Blackhole Lists (DNSBL), DDoS protection, stateful clustering, SNMP monitoring, email and SNMP notifications, RBAC, VPN support, and the best Support directly from an expert Team.

c-icap is an implementation of an ICAP server. It can be used with HTTP proxies that support the ICAP protocol such as the Squid 3.x HTTP proxy server to implement content adaptation/filtering services.

This program allows you to use SSH, TELNET, VNC, FTP and any other Internet application from behind HTTP(HTTPS) and SOCKS(4/5) proxy servers. This "proxifier" provides proxy server support to any app.

The xfrpc project is an implementation of frp client written in C language for OpenWRT and IOT system. The main motivation of this project is to provide a lightweight solution for devices with limited resources such as OpenWRT devices which often have limited ROM and RAM space. The project aims to provide a frp client that uses less space and memory than other available options.

mpg321 is a completely Free drop-in replacement for mpg123. It has been designed to work as a drop-in replacement for mpg123, for the use of front ends, shell scripts, etc. It does all mp3 decoding using the high-quality integer-only MAD library.

OpenChange is a portable Open Source implementation of Microsoft Exchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or Microsoft Exchange servers. OpenChange client-side library is used in existing messaging clients and is the solution in new projects to communicate natively with Microsoft Exchange and Exchange-compatible servers. OpenChange server is a transparent Microsoft Exchange server replacement using native Exchange protocols and does not require any plugin installation in Outlook.

nuster is a high-performance HTTP proxy cache server and RESTful NoSQL cache server based on HAProxy. It is 100% compatible with HAProxy and takes full advantage of the ACL functionality of HAProxy to provide a fine-grained caching policy based on the content of request, response or server status. nuster can be used as an HTTP/TCP load balancer just like HAProxy. nuster can also be used as a RESTful NoSQL cache server, using HTTP POST/GET/DELETE to set/get/delete Key/Value objects. It can be used as an internal NoSQL cache that sits between your application and a database like Memcached or Redis as well as a user-facing NoSQL cache that sits between the end-user and your application. It supports headers, and cookies, so you can store per-user data to the same endpoint.

P3Scan is a fully transparent scanning proxy-server for email clients. It provides scanning of incoming/outgoing email messages for Virus''s, Worms, Trojans, Spam, and harmfull attachments. It can also parse messages for web-bugs.

Anonymous proxy server. Supports http, https, socks. Can be used as a normal proxy or as a p2p anonymous proxy. Web based drag and drop access configuration. Works with windows, linux. IE, firefox, etc. Visit http://anonproxyserver.sf.net/ for more info.

ModSecurity is a web application firewall that can work either embedded or as a reverse proxy. It provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis.

A Free SOCKS proxy server for Linux, macos and FreeBSD

Ziproxy is forwarding HTTP proxy server aimed to speed up low-bandwidth connections. It does so by gzipping HTML and using lossy compression of GIF, PNG and JPEG pictures. Ziproxy also offers JPEG 2000 support, transparent proxying and more.

httpdbg is an HTTP proxy server which is single-threaded and prints every HTTP request and response to a log file as well as to stdout. It effectively single-threads your browser, which can help in debugging race conditions.

This project is a authentication plugin for the Squid proxy server that authenticates users against an ldapv3 server. It includes support for static and dynamic groups.

Middleman is an advanced HTTP/1.1 proxy server with features designed to increase privacy and remove unwanted content.

It is a versatile DNS Proxy server with DNS firewall which filters DNS traffic between local computer and DNS servers with flexible rules, supports blocking by IP geography, caching, import/export rules into XML. With a click of a button acts as a DNS proxy (or DNS server), supports multiple client authentication methods, calculates statistics for DNS servers and proxy clients, supports load balancing between multiple upstream DNS servers.

YAPH - Yet Another Proxy Hunter - intended for validation of any given SOCKS 4/5 or HTTP proxy server for compatibility with TCP tunneling features.

Myproxy is Simple proxy server It acts as a filtering agent can block unwanted content from web just by adding unwanted hosts to a file

uoproxy is a proxy server for the MMORPG Ultima Online. This is useful for traversing firewalls. Still being under heavy development, there are more features planned, like disconnected operation, automatic relogin after server failure...

Absinth is a C++ Object-Oriented Multiprocess Multithreaded Proxy Server. Able to serve a great number of clients as a little LAN

freedb proxy server for RISC OS. To allow clients to get freedb information for CDs via a simple API.

Aleksoft Proxy allows tunneling TCP/IP traffic through a proxy server located outside of both service provider and consumer firewalls. The proxy consists of two executables, listener and connector, which may run on the same or different computers.

SORBS - Spam and Open Relay Blocking System - NOT http://www.sorbs.net/ This project is to provide a SMTP proxy that automatically checks incoming SMTP connections for origination from a server with an unsecured SMTP server and/or Proxy server.

Authenticating proxy server software for Mac OS X. The front-end is written in Obj-C using the Cocoa framework, but the actual proxy daemon application is written in C using plain BSD sockets.