Showing 289 open source projects for "operating systems"

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  • 1
    Tutanota

    Tutanota

    Open source email service with a strong focus on security and privacy

    Tutanota is an open source email client focused on security and privacy. It is built with end-to-end encryption and 2FA, so you can be assured of utmost email security. Tutanota is always encrypted, so whether you’re using their secure webmail client, mobile apps or desktop clients, you can be sure to communicate securely.
    Downloads: 8 This Week
    Last Update:
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  • 2
    Thunderbird for iOS

    Thunderbird for iOS

    Open Source Email App for iOS

    Thunderbird iOS is the official iPhone and iPad email client offering from the Thunderbird project, bringing the capabilities of a feature-rich, open-source email experience to iOS devices with native UI and Apple platform integrations. The app gives users a powerful tool for managing multiple email accounts, including IMAP and POP3 configurations, and supports modern authentication flows like OAuth for popular providers. Designed with mobile usability in mind, it includes familiar gestures,...
    Downloads: 36 This Week
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  • 3
    Thunderbird for Android

    Thunderbird for Android

    Open Source Email App for Android (fka K-9 Mail)

    Thunderbird Android is the mobile counterpart of the popular Thunderbird email client, reimagined for Android phones and tablets so users can access, send, and organize email from multiple accounts with advanced features found in desktop clients. It embraces modern mobile UI design while supporting robust email protocols (IMAP/POP3) and standards like OAuth for secure logins to services such as Gmail, Outlook, or custom mail providers. The app is built to handle complex mailbox structures,...
    Downloads: 7 This Week
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  • 4
    MailTrackerBlocker

    MailTrackerBlocker

    Email tracker, read receipt and spy pixel blocker plugin, macOS Mail

    MailTrackerBlocker is a macOS Mail plugin that prevents email tracking pixels from collecting user data. It enhances privacy by blocking hidden tracking mechanisms used by marketing emails.
    Downloads: 0 This Week
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    Proton Mail for Android

    Proton Mail for Android

    Proton Mail Android app

    Proton Mail for Android is the official mobile application that lets users access their Proton Mail encrypted email accounts securely on Android devices, providing the full suite of messaging features while preserving end-to-end encryption and user privacy. Designed for modern Android phones and tablets, the app lets users send, receive, organize, and search encrypted emails, create new Proton accounts, manage multiple accounts, and apply labels or folders to keep messages tidy — all within...
    Downloads: 4 This Week
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  • 6
    K-9 Mail

    K-9 Mail

    Open Source Email App for Android

    K-9 Mail is an advanced, open-source email client for Android that's focused on making it easy to chew through large volumes of email. It's designed to be easy to use by both novice and power users, with plenty of useful features. It has IMAP push email support, support for multiple accounts, support for POP3 and Exchange 2003/2007 (with WebDAV), flagging, filing, signatures and more! K-9 Mail also offers a light and dark theme, keyboard shortcuts and emoji support. Like man's best friend,...
    Downloads: 1 This Week
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  • 7
    Proton Mail for iOS

    Proton Mail for iOS

    Secure email that protects your privacy

    Proton Mail for iOS is the official iPhone and iPad client that brings Proton’s secure, end-to-end encrypted email service to Apple’s mobile ecosystem, combining strong privacy protections with native performance and gestures. The app allows users to sign in to one or multiple Proton Mail accounts, read and compose encrypted messages, schedule emails, protect emails with passwords, set expiration timers, and organize mail with labels and folders inside a smooth, intuitive iOS interface. It...
    Downloads: 1 This Week
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  • 8
    ObjectivePGP

    ObjectivePGP

    ObjectivePGP is an open-source library for iOS and macOS

    ObjectivePGP is an open-source library for OpenPGP encryption, decryption, signing, and verification in Objective-C and Swift. It enables developers to add PGP-based security to iOS and macOS apps.
    Downloads: 1 This Week
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  • 9

    bogofilter -- Fast Bayesian Spam Filter

    Fast Bayesian spam filter along lines suggested by Paul Graham

    The bogofilter package implements a fast Bayesian spam filter as suggested by Paul Graham in "A Plan For Spam" <http://www.paulgraham.com/spam.html>. It is written in C. Supported platforms: Linux, FreeBSD, Solaris, OS X, HP-UX, AIX, RISC-OS, ...
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    Downloads: 71 This Week
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  • 10
    MultiMail Offline Reader
    MultiMail is an offline mail packet reader for Unix and other systems. It currently supports the Blue Wave, QWK, OMEN, OPX and SOUP formats. It has a full screen, color user interface, built with the curses library.
    Downloads: 9 This Week
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  • 11
    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server implements multiple spam filters

    The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24261. A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2 are...
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    Downloads: 37,880 This Week
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  • 12
    Eclipse Mail

    Eclipse Mail

    eMail is a fork of Interlink for IA-32 i686 with more optimizations.

    Eclipse Mail is a fork of Interlink Mail and News made for Windows XP and runs on IA-32 i686 platforms. Some advantages over upstream and roytam1's mailnews are more optimizations and better interoperability with upstream. (using SQL storage intead of DBM)
    Downloads: 1 This Week
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  • 13
    GoldBug - Encrypted Communications

    GoldBug - Encrypted Communications

    Chat Messenger. E-Mail-Client. Websearch. Filetransfer.

    GoldBug is a decentralized & secure communication suite that offers an integrated e-mail client, an instant messenger & a file transfer. Also included is an URL-RSS-DB & a p2p web search. Current vers. w/ McEliece Algorithm. GoldBug has been 2013 - 2023 ten years just another Graphical User Interface of the Spot-On Encryption Suite. Main GUI features: Minimal & colorful Interface with Tabs in the East. Microsoft & Qt MinGW deprecated Win32 & for Compiling: ●...
    Downloads: 6 This Week
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  • 14
    Perl ECS

    Perl ECS

    EMDIS::ECS Perl module

    Perl ECS implements the EMDIS Communication System (ECS), following specifications developed for the European Marrow Donor Information System (EMDIS). ECS is a "communication service for the automatic exchange of messages" via email. Published EMDIS::ECS releases are available from CPAN.
    Downloads: 2 This Week
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  • 15
    Multiuser BBS/Internet Server Software for multiple platforms including Windows and Linux (legacy versions maintained for DOS and OS/2). Multithreaded modular C/C++ project that includes Telnet, FTP, and Mail servers and support for popular DOS doorgames.
    Downloads: 0 This Week
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  • 16
    IndiMail
    Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support
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    Downloads: 1 This Week
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  • 17
    plutoemail

    plutoemail

    Email reader for RISC OS operating system.

    Pluto is an email and newsgroup reader for the RISC OS operating system (see https://www.riscosopen.org/), developed by Jonathan Duddington from 1997 to 2004. It stores emails and news articles in Boxes, and they can be Listed, Viewed, Written, Spell checked, Replied to, Searched and even Spoken out loud! After Pluto was released under GPLv3 here on SourceForge in 2013, it has had many improvements. Pluto runs on any version of RISC OS later than v3.10, including RISC OS 5 computers...
    Downloads: 1 This Week
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  • 18

    gross

    Gross greylisting server

    Gross is a greylisting server. The features that make gross stand out from other greylisters are: - it's blazingly fast - it's amazingly resource efficient - it can be configured to query DNSBL databases, and enforce greylisting only for hosts that are found on those databases - it can block hosts that match multiple DNSBL's - it can be replicated and run parallel on two servers - It supports Sun Java System Messaging Server, Postfix, Sendmail and Exim.
    Downloads: 7 This Week
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  • 19

    libquickmail

    C library for sending e-mail (with attachments) from C/C++

    C library intended to give C/C++ developers a quick and easy way to send e-mail from their applications. Supports multiple To/Cc/Bcc recipients and multiple attachments without size limitation. For the actual SMTP communication either libcurl can be used or the built in SMTP support. The library can also be used to just create a multipart MIME message body. Also comes with a command line application (quickmail) for sending mails (mutiple attachments supported) from command line or...
    Downloads: 0 This Week
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  • 20
    Mailfilter

    Mailfilter

    Remote anti spam utility

    Mailfilter is a flexible utility for UNIX (-like) operating systems to get rid of unwanted spam mails, before having to go through the trouble of downloading them into the local computer. It offers support for one or many POP accounts.
    Downloads: 0 This Week
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  • 21
    BSW Mailer

    BSW Mailer

    Scrip to send mail with attachments

    This Scrip can send email with or without multiple attachments. It is written in PHP and needs MySQL database the setup of this script is very easy Hint: This script developed from another script. This script creates a table with name members in your database if exist this name before you should change the name of table in install.php and change the same name in bswmail.php
    Downloads: 0 This Week
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  • 22
    The LDAP proxy is designed to be the part of the email encryption infrastructure which would simplify finding and using public encryption keys contained in X.509 public certificates.
    Downloads: 2 This Week
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  • 23
    Quick Spam Filter is a small, fast spam filter that works by learning to recognise the words that are more likely to appear in spam than non-spam. It is intended to be used in a procmail recipe to mark email as being possible spam.
    Downloads: 0 This Week
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  • 24
    ORSEE
    ORSEE is a web-based Online Recruitment System for Economic Experiments. Key features: attribute query selection, random recruitment, experiment calendar, reputation system, automated mailing, pdf output, complete documentation.
    Downloads: 0 This Week
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  • 25
    This program is an email antivirus/antispam gateway. It is an interface to the postfix or sendmail (or any other smtpd), which runs antivirus and/or spamchecker. Its modular architecture can use any combination of antivirus/spamchecker according to co
    Downloads: 0 This Week
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