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Open Source C Communications Software

Browse free open source C Communications Software and projects below. Use the toggles on the left to filter open source C Communications Software by OS, license, language, programming language, and project status.

  • Gen AI apps are built with MongoDB Atlas Icon
    Gen AI apps are built with MongoDB Atlas

    Build gen AI apps with an all-in-one modern database: MongoDB Atlas

    MongoDB Atlas provides built-in vector search and a flexible document model so developers can build, scale, and run gen AI apps without stitching together multiple databases. From LLM integration to semantic search, Atlas simplifies your AI architecture—and it’s free to get started.
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  • Captain Compliance - Data Privacy and Compliance Software Icon
    Captain Compliance - Data Privacy and Compliance Software

    Privacy Compliance Software - Avoid Fines and Prevent Lawsuits

    Captain Compliance handles your data privacy requirements so you can be privacy compliant. No more compliance stress, stop stressing over regulatory risks – just privacy protection managed by experts. Our user-friendly platform backed by privacy professionals simplifies the process of navigating regulations, giving your customers transparent choices, and building essential trust for your organization.
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  • 1
    Gammu

    Gammu

    Cellular manager for mobile phones/modems

    Gammu is a cellular manager for mobile phones/modems. It contains libraries and functions for ringtones,logos,phonebook,SMS,etc. (used by external software), a command line version (with backup/restore) and SMS gateway (with MySQL and PostgreSQL supp
    Downloads: 12 This Week
    Last Update:
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  • 2
    vcard program vCardz_i

    vcard program vCardz_i

    VCF vcard, XML xcard, JSON jcard;View, Edit, Convert, Export, CSV, QR

    vCardz_i supports VCF, XML and JSON vcards; View, Create, Edit, Extract, Convert, Import CSV, TAB or |, Export CSV, Excel® .xlsx, TXT or ODS spreadsheet. Create vcard QR code images, in MEcard, vCard or xCard format., or create your own QR from your text entry. Voice output of selected data or a complete address. Create multiple Themes to easily switch appearance. Free multifunction vcard address book program to handle multilingual VCF, XML and JSON vcard files. Use the same vcards from your phone, tablet, iOS, other devices, as well as GMail, Outlook, Apowersoft Phone Manager, and others, in Windows® . Supports vcard vcf 2.1, vcf 3.0, vcf 4.0, xcard 4.0, and jcard 4.0. Can run from a USB drive. Help file and example VCF, XML, and JSON files are provided too. vCardz_i version 3.1.1 Optimize for no mouse and screen reader NVDA 05/18/25 two prior versions at: https://sourceforge.net/projects/vcardz/files/Older%20Installation%20Files/
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    Downloads: 62 This Week
    Last Update:
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  • 3
    OpenL2TP is an L2TP client/server written specifically for Linux. It has been designed for use as an enterprise L2TP VPN server or for use in commercial, Linux-based, embedded networking products.
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    Downloads: 47 This Week
    Last Update:
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  • 4
    ZEG / Zero-Effort-Groupware

    ZEG / Zero-Effort-Groupware

    SOGo Zero-Effort-Groupware

    The ZEG (Zero Effort Groupware) edition of SOGo is intended to provide a complete out-of-the-box testing environment of SOGo, the Open Source messaging and calendaring software.
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    Downloads: 22 This Week
    Last Update:
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  • Dynamic Work and Complex Project Management Platform | Quickbase Icon
    Dynamic Work and Complex Project Management Platform | Quickbase

    Quickbase is the leading application platform for dynamic work.

    Our no-code platform lets you easily create, connect, and customize enterprise applications that fix visibility and workflow gaps without replacing a single system.
    Learn More
  • 5
    XASTIR

    XASTIR

    Multiplatform Ham Radio APRS and Mapping Program

    NOTE: Code commits are FROZEN on SourceForge: New code is now at <http://github.com/Xastir/Xastir>. Real-time tracking & messaging of stations via radio/internet APRS data streams, w/125 map formats supported. Linux/FreeBSD/Solaris/MacOSX/Windows in any of 7 languages. Can also be used for mobile mapping w/GPS. MAILING LISTS ARE AT: PROJECT->WEB SITE.
    Downloads: 5 This Week
    Last Update:
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  • 6
    OpenChange Project

    OpenChange Project

    Microsoft Exchange compatible server and client libraries

    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.
    Downloads: 8 This Week
    Last Update:
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  • 7
    Using the vCard format as the data storage structure, Rolo will keep track of your contacts and display them to you with a curses front end.
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    Downloads: 12 This Week
    Last Update:
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  • 8
    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: 3 This Week
    Last Update:
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  • 9
    OpenEMM e-mail & marketing automation

    OpenEMM e-mail & marketing automation

    software for email automation (newsletters, transaction mails, etc.)

    This is an archive for old versions of OpenEMM. You will find the latest version of OpenEMM here: https://wiki.openemm.org OpenEMM is a browser-based enterprise application for email automation like info and marketing newsletters, transaction mails or multi-stage email campaigns. OpenEMM offers tons of features for professional users, among them: a great user interface, template-based HTML mailings, automatic bounce management, mail opening and link tracking, lots of graphical realtime statistics, a content management system, self-defined and behaviour-based target groups, a multi-queue mail backend for maximum sending performance, a time-driven automated data import and export feature, an extensive set of webservices, a plugin interface to easily extend the core functionality, a scripting feature to enhance the functionality of OpenEMM with triggerable customized actions and an audit-proof user activity log.
    Downloads: 2 This Week
    Last Update:
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  • E-commerce Fulfillment For Scaling Brands Icon
    E-commerce Fulfillment For Scaling Brands

    Ecommerce and omnichannel brands seeking scalable fulfillment solutions that integrate with popular sales channels

    Flowspace delivers fulfillment excellence by pairing powerful software and on-the-ground logistics know-how. Our platform provides automation, real-time control, and reliability beyond traditional 3PL capabilities—so you can scale smarter, faster, and easier.
    Learn More
  • 10

    linSmith

    Smith chart intended for educational use

    A Smith charting program. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbars.
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    Downloads: 2 This Week
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  • 11
    The ATSlog software provides a handy web-oriented interface for collecting, viewing and analysing calls for various types of PBX (Private Branch eXchange) models.
    Downloads: 4 This Week
    Last Update:
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  • 12
    Doc2pdf is an email robot that converts Microsoft Office attachments (.doc, .ppt, and .xls) to PDF. Next time you email a Microsoft Office document, CC doc2pdf. Doc2pdf will convert the attachment to PDF, and send it in a reply to all recipients.
    Downloads: 4 This Week
    Last Update:
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  • 13
    dialDTMF is a library for dialing DTMF's (it is not a DTMF tone generator). An example usage of the library is included which is a Pocket Contact plugin to dial telephone numbers from a PDA running the Microsoft Pocket PC platform
    Downloads: 2 This Week
    Last Update:
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  • 14
    m2 is a network message bus designed to support low-latency, service-routed message passing, with push updates and scalable publish / subscribe capabilities. Client support exists for Tcl and Javascript currently, with others planned.
    Downloads: 2 This Week
    Last Update:
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  • 15
    Application sharing software that allows individual windows to be replicated to other computers. Remote collaboration tool based on a modified VNC protocol. Its advantage is to keep some things, like email, private, while sharing other desktop apps.
    Downloads: 1 This Week
    Last Update:
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  • 16
    The Calculator File-Xferer, transfers files from and to a casio calculator through a serial interface.
    Downloads: 1 This Week
    Last Update:
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  • 17
    Null Groupware is a self-hosting web based groupware system written in c. It's portable, modular, and has a complete api for third party developers' extensions. Features include event scheduling, call tracking, contact management, web-based email, a w
    Downloads: 1 This Week
    Last Update:
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  • 18
    Get remote control access to your Windows PC anywhere. The goal of this project is to be a "Let's Just Get Started!" remoting tool for the help desk technician, being fully functional and able to operate w/o requiring addon plugins or setup installations
    Downloads: 1 This Week
    Last Update:
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  • 19
    Virtual Access Open Source Project
    The Virtual Access Foundation's Virtual Access Open Source (VAOS) is a well-established win32 mail news and collaborative conferencing tool. Modified BSD license. Please go to our homepage http://www.virtual-access.org for more information and support.
    Downloads: 1 This Week
    Last Update:
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  • 20
    DEPRECATED - This is now hosted at https://github.com/Yeraze/ytnef ytnef is a program to work with procmail to decode TNEF streams (winmail.dat attachments) like those created with Outlook. Unlike other similar programs, it can also create vCalendar/vCard entries from meeting requests, address cards, and task entries.
    Downloads: 1 This Week
    Last Update:
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  • 21
    ZSRep (Zaurus Synchronization Repository) is a project whose main goal is to provide a professional cross-platform solution for synchronizing one's Sharp Zaurus with any Desktop PIM software on the Linux or Mac OS X operating system.
    Downloads: 1 This Week
    Last Update:
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  • 22
    A resource-conscientious, flexible, modular, platform-independent, scalable and robust server based on ircd-ratbox.
    Downloads: 1 This Week
    Last Update:
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  • 23
    Af-Arch is an Open Source N-tier framework to build distribuited applications. Its license schema allows Open Source and commercial (closed source) applications. This is the foundation to build an new set of applications in a fast and reliable way.
    Downloads: 0 This Week
    Last Update:
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  • 24
    Assist takes plain english commands and interpretes them to carry out a specified action. Example: "remind me to hand in paper on monday" will create a reminder in your PIM with the subject: "hand in paper", due date being the very next Monday.
    Downloads: 0 This Week
    Last Update:
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  • 25
    AMS is a suite of software intended to make day to day administration and monitoring of an Asterisk PBX server easier. It contains a daemon that acts as a proxy to Asterisk's Manger Interface and a GTK GUI application for monitoring and administration.
    Downloads: 0 This Week
    Last Update:
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