ALL TOOLS
289 curated software tools across 21 categories. No marketing hype. Just the facts.
phpList
OPEN SRCNewsletter and email marketing with advanced management of subscribers, bounces, and plugins
Postorius
OPEN SRCThe web interface for GNU Mailman.
Schleuder
OPEN SRCGPG-enabled mailing list manager with resending-capabilities
Sympa
OPEN SRCSympa manages email lists for communities and organizations
Cypht
OPEN SRCEmail feeds and web subscriptions in one unified inbox
Roundcube
OPEN SRCBrowser-based IMAP client with an application-like user interface
SnappyMail
OPEN SRCSimple, modern, lightweight & fast web-based email client (fork of RainLoop)
SquirrelMail
OPEN SRCA simple webmail client for reading email anywhere
Ergo
OPEN SRCModern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer
InspIRCd
OPEN SRCModular IRC server written in C++ for Linux, BSD, Windows, and macOS.
Kiwi IRC
OPEN SRCA modern web IRC client with customizable themes.
AnonAddy
OPEN SRCCreate email aliases to protect your real address.
b1gMail
OPEN SRCComplete email solution that runs on any webspace with PHP and MariaDB. It supports POP3 catchall mailboxes and can also integrate with Postfix or b1gMailServer if you're running your own server
DebOps
OPEN SRCYour Debian-based data center in a box. A set of general-purpose Ansible roles that can be used to manage Debian or Ubuntu hosts
docker-mailserver
OPEN SRCProduction-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database
Dovel
OPEN SRCSMTP server that sends and receives emails according to a simple configuration file, with an optional web interface that you can use to browse your emails
Inboxen
OPEN SRCLets you have an infinite number of unique inboxes
iRedMail
OPEN SRCFull-featured mail server solution based on Postfix and Dovecot
Maddy Mail Server
OPEN SRCAll-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon
Mail-in-a-Box
OPEN SRCTurns any Ubuntu server into a fully functional mail server with one command
Mailcow
OPEN SRCMail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration
Mailu
OPEN SRCSimple yet full-featured mail server as a set of Docker images
Modoboa
OPEN SRCMail hosting and management platform including a modern and simplified web user interface
Mox
OPEN SRCComplete e-mail solution with IMAP4, SMTP, SPF, DKIM, DMARC, MTA-STS, DANE and DNSSEC, reputation-based and content-based junk filtering, Internationalization (IDNA), automatic TLS with ACME and Let's Encrypt, account autoconfiguration, and webmail
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HOW WE REVIEW SOFTWARE
Every tool in the VentureGaps directory is evaluated through comprehensive research, verified user feedback, and data-driven analysis. We assess pricing transparency, feature depth, user satisfaction, and integration capabilities. Our ratings reflect real-world usage patterns and publicly available data — not paid placements. The directory is continuously updated to reflect the latest changes in pricing, features, and market positioning.
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