Browse free open source C# CRM Software and projects below. Use the toggles on the left to filter open source C# CRM 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

    The database for AI-powered applications.

    MongoDB Atlas is the developer-friendly database used to build, scale, and run gen AI and LLM-powered apps—without needing a separate vector database. Atlas offers built-in vector search, global availability across 115+ regions, and flexible document modeling. Start building AI apps faster, all in one place.
    Start Free
  • Find Hidden Risks in Windows Task Scheduler Icon
    Find Hidden Risks in Windows Task Scheduler

    Free diagnostic script reveals configuration issues, error patterns, and security risks. Instant HTML report.

    Windows Task Scheduler might be hiding critical failures. Download the free JAMS diagnostic tool to uncover problems before they impact production—get a color-coded risk report with clear remediation steps in minutes.
    Download Free Tool
  • 1
    Onfinity All-in-One ERP

    Onfinity All-in-One ERP

    Onfinity is a modern, AI driven All-in-One ERP

    Onfinity (formerly Vienna Advantage) is a modern and future oriented ERP developed in C#.Net, jQuery, PostgreSQL and React Native Mobile app. Functional Details at: https://www.onfinity.io/erp-editions-comparison.php Open Source Modules: - Finance - Budgeting - Order Management - Asset Management - HR Management - Project Management - Customer Relationship Management - eCommerce and more Based on a No-Low Code Framework, Inbuilt Workflow Editor, Report Writer and more, it comes with an excellent Architecture. Community comes with Free community support, Access to Market with all Updates and Patches and implementation tools.
    Downloads: 35 This Week
    Last Update:
    See Project
  • 2
    OpenPetra

    OpenPetra

    Free Administration Software for Non-Profits

    OpenPetra is an administration software for charities and can be used to manage personnel, supporters, book keeping, gift receipting, accounts payable, etc.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 3
    Next generation web-based, multi-tenant, distributed, mulit-lingual, inbound, outbound Video enabled VoIP & VVoIP call/ contact center solution for Asterisk with Built-in phone, IVR, CRM, Predictive dialer, ACD, Chat, Mail, Fax, Video and other features.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    CRM für Kleinbüro und Heimbüro mit Schwerpunkt auf Verwaltung von Personenprofilen. Geeignet sowohl private Arbeitsvermittler und Arbeitslosen-Initativen, als auch für Fundraising, Wohnungsmarkt, HelpDesk/Hotline und mehr... Wichtige Mitteilung: An diesem Projekt arbeiten wir seit 2010 nicht mehr. Support-Anfragen werden nicht mehr beantwortet.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • 5
    This is a framework for developers of the SAP Business One ERP CRM solution.It enhances the development process because annoying steps you have to do while making a GUI for B1 are already done. It also works with the B1DE and you can use any .net languag
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6
    METHIS /data.mill for Excel®

    METHIS /data.mill for Excel®

    Cleanse, correct and enrich customer data directly in Microsoft Excel.

    METHIS /data.mill for Excel is a convenient way to cleanse, correct and enrich personal data of your customers and prospects directly in your Microsoft Excel. Simply mark all data you want to process, right click on them and choose your preferred function. The data will be processed in the blink of an eye and the result is written next to the origin data. Key Features: - check and enrich postal addresses (worldwide) - recognize the gender based on the first name - check the spelling and mail server of email addresses - check and unify phone numbers - resolve information of companies within the European Union - check your records for duplicate entries - split first name and last name - capitalization of names - and more easy-to-use functions ======================================== All functions included in the Excel Add-In are available as API to enable the implementation in custom solutions: https://gateway.methis.at
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    Extensible highly scalable ERP with encrypted XML backend; allows binding of any frontend (.NET,MONO,Java...).PlugIns:Contact management,disposition,invoices,reports,commAddon (e-mail,fax,TAPI,buddies,chat),osCommerce,StoreNuke, eBay,Amazon...
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    UniTrader

    UniTrader

    Trade multiple financial products from one advanced online trading

    UniTrader offers Global Brokerage Accounts and instant access to financial instruments around the world such as Stocks, Financial Sectors/ETFs, Indices, Currencies and Commodities. Whatever and wherever a customer wants to trade, UniTrader Brokerage Account and our trading platforms offer unparalleled accesses to the most liquid financial instruments in the world. UniTrader clients can trade the most well-known and most liquid financial products from a single screen through the UniTrader Brokerage Account. Our team of customer service specialists is constantly available to provide personal support to each and every customer.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    dagoCRM should be an CRM-Tool for a small business company. It should contain: * detailed adress-informations * customer history * individual Reporting * easy customer stats * fast contract information * possibly an integrated (or a plugin?) dms * timema
    Downloads: 0 This Week
    Last Update:
    See Project
  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 10
    AthenaCentral

    AthenaCentral

    Membership management software

    AthenaCentral is used since 2006 by health club chains, fitness centers, gyms and many membership organizations. It offers multilingual, multi-country and multi-center functionality. Its flexibility and power enables you to quickly adapt to environmental as well as organizational changes. The system includes components for integrating additional technologies such as access control (barcode, RFID, fingerprints, ...). It is fully compatible iso20022 (financial information transactions) and iso18004 (QR Code). COVID : Modify all your contracts including complicated situations (Bonus Time and/or Time Stop) at once Developed by Josh Cimers - Prototypes # club management club member administration, membership management, gym management
    Downloads: 3 This Week
    Last Update:
    See Project
  • Previous
  • You're on page 1
  • Next