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Install Download.sa on iPhone or iPad: tap the Share button, then choose “Add to Home Screen”.

Open-source alternatives to Aster Mail

Projects with an open-source licence: you can inspect, modify and self-host the code.

Same categories and verticals plus the editors' list, in an independent order. Partners and ads never change it.

  1. KeePassXC

    KeePassXC Team

    87

    An offline, encrypted password manager

    Open source 88 WindowsLinuxmacOS
  2. Bitwarden

    Bitwarden Inc.

    87

    Open-source cloud password manager

    Open source 85 WindowsLinuxmacOSAndroid
  3. WireGuard

    WireGuard (Jason A. Donenfeld)

    87

    A fast, modern and secure VPN protocol

    Open source 80 WindowsLinuxmacOSAndroid
  4. ClamAV

    Cisco Systems (ClamAV)

    87

    Open-source antivirus engine for servers

    Open source 78 WindowsLinuxmacOS
  5. MFCMapi

    Microsoft Corporation

    87

    Provides access to MAPI stores to facilitate investigation of Exchange and Outlook issues and to provide developers with a sample for MAPI development.

    Open source 77 Windows
  6. Microsoft Azure Guest Proxy Agent

    Microsoft Corporation

    87

    This project introduces the Guest Proxy Agent (GPA) to enhance the security of the Azure Instance Metadata Service and Azure Wireserver endpoints (available in Azure IaaS VM/VMSS).

    Open source 77 Windows
  7. Microsoft Azure Kubelogin

    Microsoft Corporation

    87

    A Kubernetes credential (exec) plugin implementing Azure authentication.

    Open source 77 Windows
  8. Microsoft Azure Quick Review

    Microsoft Corporation

    87

    A tool to check compliance of Azure resources with Azure best practices and recommendations.

    Open source 77 Windows
  9. NeoChat

    KDE e.V.

    87

    Matrix Client

    Open source 77 WindowsLinux
  10. 87

    Secure two-factor authentication app by Proton

    Open source 70 Windows
  11. 87

    A desktop application used to sync your Bitwarden enterprise organization to an existing directory of users and groups.

    Open source 60 Windows
  12. Magika

    Google LLC

    87

    Fast and accurate AI powered file content types detection

    Open source 60 Windows
  13. Ruqola

    KDE e.V.

    84

    Rocket.Chat client

    Open source 82 Windows
  14. Konversation

    KDE e.V.

    82

    IRC client

    Open source 77 WindowsLinux
  15. Thunderbird

    MZLA Technologies (Thunderbird)

    77

    Free email and calendar

    Open source 80 WindowsLinuxmacOSAndroid
  16. OnionShare

    Micah Lee, et al.

    75

    OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network

    Open source 77 WindowsLinux
  17. Telegram Desktop

    Telegram FZ-LLC

    72

    Fast messaging synced across devices

    Open source 88 WindowsLinuxmacOSAndroid
  18. Signal

    Signal Messenger LLC

    72

    Private messaging, end-to-end encrypted

    Open source 85 WindowsLinuxmacOSAndroid
  19. Wireshark

    Wireshark Foundation

    72

    Professional network packet analysis

    Open source 80 WindowsLinuxmacOS
  20. 2FAGuard

    Timo Kössler

    67

    A modern and secure Windows app for managing your 2FA authentication codes

    Open source 77 Windows
  21. 3va

    OdinoCano

    67

    Secure-by-default JavaScript and TypeScript runtime.

    Open source 77 Windows
  22. age

    FiloSottile

    67

    A simple, modern and secure encryption tool (and Go library) with small explicit keys, no config options, and UNIX-style composability.

    Open source 77 Windows
  23. agentbridge

    AGNTCY

    67

    CLI binary for the agentbridge general-purpose agent interconnect.

    Open source 77 Windows
  24. ALEAPP

    abrignoni

    67

    Android Logs Events And Protobuf Parser

    Open source 77 Windows
  25. 67

    VPN client

    Open source 77 macOS
  26. AndroidMessages

    OrangeDrangon

    67

    Run Android Messages as a desktop app, a la iMessage

    Open source 77 Windows
  27. Authme

    levminer

    67

    Simple cross platform two-factor authentication app.

    Open source 77 Windows
  28. Auto Start Confirm

    Christian Galla

    67

    Notifies and asks for permission if a program wants to get automatically started when Windows is started, or a user is logging on.

    Open source 77 Windows
  29. AWS IAM Authenticator

    Kubernetes SIGs

    67

    A tool to use AWS IAM credentials to authenticate to a Kubernetes cluster

    Open source 77 Windows
  30. AyuGram Desktop

    Radolyn Labs

    67

    Desktop Telegram client with good customization and Ghost mode.

    Open source 77 Windows

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