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Browse free open source Post-Office software and projects below. Use the toggles on the left to filter open source Post-Office software by OS, license, language, programming language, and project status.

  • The All-in-One Commerce Platform for Businesses - Shopify Icon
    The All-in-One Commerce Platform for Businesses - Shopify

    Shopify offers plans for anyone that wants to sell products online and build an ecommerce store, small to mid-sized businesses as well as enterprise

    Shopify is a leading all-in-one commerce platform that enables businesses to start, build, and grow their online and physical stores. It offers tools to create customized websites, manage inventory, process payments, and sell across multiple channels including online, in-person, wholesale, and global markets. The platform includes integrated marketing tools, analytics, and customer engagement features to help merchants reach and retain customers. Shopify supports thousands of third-party apps and offers developer-friendly APIs for custom solutions. With world-class checkout technology, Shopify powers over 150 million high-intent shoppers worldwide. Its reliable, scalable infrastructure ensures fast performance and seamless operations at any business size.
    Learn More
  • Simple, Secure Domain Registration Icon
    Simple, Secure Domain Registration

    Get your domain at wholesale price. Cloudflare offers simple, secure registration with no markups, plus free DNS, CDN, and SSL integration.

    Register or renew your domain and pay only what we pay. No markups, hidden fees, or surprise add-ons. Choose from over 400 TLDs (.com, .ai, .dev). Every domain is integrated with Cloudflare's industry-leading DNS, CDN, and free SSL to make your site faster and more secure. Simple, secure, at-cost domain registration.
    Sign up for free
  • 1
    hMailServer is a SMTP/POP3/IMAP server for Windows. Data is stored in MySQL/MSSQL database and is easily accessed using the COM library. Project info, trackers and downloads has moved to www.hmailserver.com.
    Leader badge">
    Downloads: 6 This Week
    Last Update:
    See Project
  • 2
    Convert Webmail to POP3.Is also included a SMTP/POP3 tunneling system that allow send and receive email in a private network HTTP PROXY based. All connection are plugin based. Over 450 email server supported and tested, GMAIL POP3/SMTP over Proxy Network.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 3
    Hastymail
    Hastymail is a fast, secure, rfc-compliant, cross-platform IMAP/SMTP client application written in PHP providing a clean web interface for sending and reading E-mail. This version of Hastymail is no longer being developed. We are now working on a new version, Hastymail 3, AKA, "Cypht". http://cypht.org
    Downloads: 2 This Week
    Last Update:
    See Project
  • 4
    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.
    Downloads: 2 This Week
    Last Update:
    See Project
  • Monitoring, Securing, Optimizing 3rd party scripts Icon
    Monitoring, Securing, Optimizing 3rd party scripts

    For developers looking for a solution to monitor, script, and optimize 3rd party scripts

    c/side is crawling many sites to get ahead of new attacks. c/side is the only fully autonomous detection tool for assessing 3rd party scripts. We do not rely purely on threat feed intel or easy to circumvent detections. We also use historical context and AI to review the payload and behavior of scripts.
    Learn More
  • 5
    ClamMail is POP3 email proxy for Windows with integrated ClamAV antivirus engine. ClamMail is an Windows antivirus that protects your PC from viruses transferred via mail. Works with Outlook,Thunderbird,Eudora and many others using popular POP3 protocol
    Downloads: 1 This Week
    Last Update:
    See Project
  • 6
    Remote Mail is a multi-account Webmail manager. Quick as a webmail, yet powerful like a POP Email client, it lets you access via Web many POP accounts at once. The ideal companion for people who want to quickly read their mail everywhere they are.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 7
    CRM aka Customer Relationship Management are applications that manage customers in relation to enterprise life. Our project, Customer Touch CRM, is a CRM application for small/medium firms. The application is easy to use and install.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    New Maintainer wanted! I'm looking for a new maintainer for this project because I'm not able to attend it anymore. If you want to help please write to kuddel-fl. KShowmail is a POP3 mail checker for the KDE with these features: show number, size and more information about mails on pop3 servers in a list view, show the mail headers or complete mails, delete unwanted mail from server by configurable filters.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    liberopops is useful for users of Libero provider who cannot read email due to its change of policy. It acts as a POP3 server which interfaces itself to the webmail service still available.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Comet Backup - Fast, Secure Backup Software for MSPs Icon
    Comet Backup - Fast, Secure Backup Software for MSPs

    Fast, Secure Backup Software for Businesses and IT Providers

    Comet is a flexible backup platform, giving you total control over your backup environment and storage destinations.
    Learn More
  • 10
    Mail-It
    A HTML newsletter composer for Linux. It is a simple GUI written on Python for create and send advanced HTML newsletter.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    Mailster is a project aimed at testing software mail capabilities. It provides a mail server container to test emails sent by your apps without rewriting your application code.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    WE HAVE MOVED OFF SOURCEFORGE. PLEASE VISIT http://openwebmail.acatysmoof.com. OpenWebMail is a full-featured webmail, addressbook, calendar, and webdisk system that is designed to manage very large mail folder files in a quick and memory efficient w
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    Web-based administration tool for domains, emails and newsletters based oh PHP + PostgreSQL + postfix
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    PHPMyWebHosting (PMWH) will provide a gui viewed in a browser, which lets you adminstrate postfix-sql-based (mySQL, PostGre) emailaddresses, Apache Virtual Hosts, DNS-zones etc. When completed, PHPMyWebHosting will provide a complete webhosting-Interface
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    The PigeonAir Project aims at releasing an Open and Free GPL solution to easily build up clustered, scalable and modular email services, targetted to satisfy all ISP needs.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    Semplice interfaccia GUI intuitiva che invia posta elettronica facendo uso di Blat da riga di comando. L'applicazione è sviluppata per windows in Visual Basic 6.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    Email client for access to IMAP server, developed in C#.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    Mailserver for Win* Platform.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    this tool hack facebook account
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    a fast email client for console that support pop3 and smtp protocols also with ssl connections and more paranoic futures...
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    Pop3 server with OS/2 PM management interface and CGI applications for mailbox setup.
    Downloads: 0 This Week
    Last Update:
    See Project
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