Flatpak Packages Page 11 of 39

Browse 951 Flatpak Packages on AlternativeTo.

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  1. PrusaSlicer icon
     22 likes

    An open-source, feature-rich, frequently updated tool that contains everything you need to export the perfect print files for your 3D printer.

    Cost / License

    Application type

    Since

    • Since 2020

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    • CZ flagCzechia
    • European Union flagEU
    PrusaSlicer screenshot 1
    PrusaSlicer screenshot 1
    PrusaSlicer screenshot 2
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    26 alternatives
  2. Freelens icon
     7 likes

    Freelens is a free and open-source user interface designed for managing Kubernetes clusters. It provides a standalone application that is compatible with macOS, Windows, and Linux operating systems, making it accessible to a wide range of users.

    Cost / License

    • Free
    • Open Source (MIT)

    Since

    • Since 2025

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    Freelens screenshot 1
    23 alternatives
  3. Kasasa icon
     7 likes

    Take screenshots and put them on small floating windows; the application also allows you to decrease the window opacity when the mouse pointer is over it.

    Cost / License

    Application type

    Since

    • Since 2024

    Platforms

    • Linux
    • Flathub
    • Flatpak
    Kasasa screenshot 1
    Kasasa screenshot 1
    Kasasa screenshot 2
    +1
    Kasasa screenshot 3
    7 alternatives
  4. Mozilla VPN icon
     21 likes

    Protect your web history, feel safer on public Wi-Fi, and limit ad tracking by increasing the security of your network connection.

    Cost / License

    • Paid
    • Open Source

    Application type

    Since

    • Since 2019

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Mozilla Firefox
    • Flathub
    • Flatpak
    • US flagUnited States
    Mozilla VPN screenshot 1
    Mozilla VPN screenshot 2
    Mozilla VPN screenshot 3
    205 alternatives
  5. Red Eclipse icon
     39 likes

    Red Eclipse is a fun-filled new take on the first person arena shooter, built as a total conversion of Cube Engine 2, which lends itself toward a balanced gameplay, with a general theme of agility in a variety of environments.

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2011

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • Steam
    • Flathub
    • Flatpak
    • US flagUnited States
    Red Eclipse screenshot 1
    Red Eclipse screenshot 1
    Red Eclipse screenshot 2
    +3
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    24 alternatives
  6. ElectronMail icon
     24 likes

    ElectronMail is an Electron-based unofficial desktop client for ProtonMail end-to-end encrypted email provider. The app aims to provide enhanced desktop user experience enabling features that are not supported by the official in-browser web clients.

    Cost / License

    Application type

    Since

    • Since 2019

    Platforms

    • Mac
    • Windows
    • Linux
    • Proton Mail
    • Electron
    • Arch Linux
    • Snapcraft
    • Flathub
    • Flatpak
    • Chocolatey
    • AppImage
    • Debian
    • Ubuntu
    • Linux Mint
    • Raspberry Pi
    • Raspberry Pi OS
    • Fedora
    ElectronMail screenshot 1
    13 alternatives
  7. SchildiChat icon
     14 likes

    SchildiChat is a Matrix client based on Element with a more traditional instant messaging experience.

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2021

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • Flathub
    • F-Droid
    • Flatpak
    • DE flagGermany
    • European Union flagEU
    SchildiChat screenshot 1
    SchildiChat screenshot 2
    SchildiChat screenshot 3
    47 alternatives
  8. Umbrello icon
     41 likes

    Umbrello is a Unified Modelling Language (UML) modelling tool and code generator. It can create diagrams of software and other systems in the industry-standard UML format, and can also generate code from UML diagrams in a variety of programming languages.

    Cost / License

    Application type

    Since

    • Since 2009

    Platforms

    • Windows
    • Linux
    • Snapcraft
    • Flathub
    • Flatpak
    • DE flagGermany
    • European Union flagEU
    Umbrello screenshot 1
    57 alternatives
  9. Catalyst icon
     4 likes

    Catalyst is an intelligent, desktop-first, local-first to-do app that uses AI and the Eisenhower Matrix to help you prioritize tasks and get things done effortlessly.

    Cost / License

    • Free
    • Proprietary

    Application type

    Since

    • Since 2025

    Platforms

    • Windows
    • Linux
    • Android
    • Flathub
    • Flatpak
    • SG flagSingapore
    Catalyst screenshot 1
    Catalyst screenshot 1
    Catalyst screenshot 2
    +2
    Catalyst screenshot 3
    34 alternatives
  10. Index is a convergent file manager, it the user with a simple way to navigate and manage files. Index incorporates features such as miller columns, embedded terminal, split views, file previews, experimental WebDAV support, tags.

    Cost / License

    Application type

    Since

    • Since 2020

    Platforms

    • Linux
    • Android
    • AppImageHub
    • Linux Mobile
    • Plasma Mobile
    • Flatpak
    • Flathub
    • MX flagMexico
    Index (Maui Applications) screenshot 1
    Index (Maui Applications) screenshot 1
    Index (Maui Applications) screenshot 2
    +3
    Index (Maui Applications) screenshot 3
    74 alternatives
  11. KLatexFormula icon
     18 likes

    Tool for generating images from LaTeX equations, offering GUI and command-line access, drag-and-drop features, multiple export formats, and cross-platform support.

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2011

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    • CH flagSwitzerland
    KLatexFormula screenshot 1
    KLatexFormula screenshot 1
    KLatexFormula screenshot 2
    27 alternatives
  12. RetroDECK icon
     6 likes

    RetroDECK is a powerful all-in-one retro gaming platform designed for handheld gaming PCs like the Steam Deck, full Linux desktops, Linux HTPC setups, and Linux-based PC consoles such as the Steam Machine.

    Cost / License

    Application type

    Since

    • Since 2022

    Platforms

    • Linux
    • Flathub
    • Flatpak
    • SteamOS
    • IT flagItaly
    • European Union flagEU
    RetroDECK screenshot 1
    RetroDECK screenshot 1
    RetroDECK screenshot 2
    +3
    RetroDECK screenshot 3
    11 alternatives
  13. SpeedyNote icon
     3 likes

    SpeedyNote is a fast, open-source note-taking application designed for stylus users who need iPad-quality annotation on budget hardware. Built with native C++ and Qt, it delivers 360Hz stylus input on hardware as modest as an Intel Celeron N4000 at 1.

    Cost / License

    Application type

    Since

    • Since 2026

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • Android Tablet
    • Flathub
    • Flatpak
    • iPad
    SpeedyNote screenshot 1
    SpeedyNote screenshot 1
    SpeedyNote screenshot 2
    62 alternatives
  14. AudioRelay icon
     13 likes

    Listen to your PC audio, use your phone as a mic or stream audio from your phone.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Since

    • Since 2019

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • Flathub
    • Flatpak
    • FR flagFrance
    • European Union flagEU
    AudioRelay screenshot 1
    AudioRelay screenshot 1
    AudioRelay screenshot 2
    +1
    AudioRelay screenshot 3
    17 alternatives
  15. Oculante icon
     6 likes

    A no-nonsense hardware-accelerated image viewer. Oculante's vision is to be a fast, unobtrusive, portable image viewer with wide image format support, offering image analysis and basic editing tools.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Since

    • Since 2024

    Platforms

    • Linux
    • Mac
    • Windows
    • Flathub
    • Flatpak
    • FreeBSD
    • BSD
    • NetBSD
    Oculante screenshot 1
    Oculante screenshot 1
    69 alternatives
  16. Archives icon
     6 likes

    Every day, countless of websites go offline for good. High server costs, government censorship, venture capitalism are some of the threats, many of your favorite websites are facing.

    Cost / License

    Application type

    Since

    • Since 2024

    Platforms

    • Linux
    • Linux Mobile
    • Flathub
    • Flatpak
    • GR flagGreece
    • European Union flagEU
    Archives screenshot 1
    Archives screenshot 1
    Archives screenshot 2
    8 alternatives
  17. PopcornFX icon
     6 likes

    A suite of tools dedicated to real-time visual effects creation, along with ready-to-run mainstream game engine integrations and a runtime simulation framework for custom integration.

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Since

    • Since 2025

    Platforms

    • Windows
    • Linux
    • Mac
    • Flathub
    • Flatpak
    • FR flagFrance
    • European Union flagEU
    PopcornFX screenshot 1
    PopcornFX screenshot 1
    PopcornFX screenshot 2
    +3
    PopcornFX screenshot 3
    27 alternatives
  18. Play your favorite movies and video files without hassle. Showtime features simple playback controls that fade out of your way when you're watching, fullscreen, adjustable playback speed, multiple language and subtitle tracks, and screenshots — everything you need for a...

    Cost / License

    Application type

    Since

    • Since 2024

    Platforms

    • Linux
    • Flathub
    • GNOME
    • Flatpak
    • Linux Mobile
    • US flagUnited States
    Showtime Player screenshot 1
    81 alternatives
  19. Clone Hero icon
     13 likes

    Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller, Game Controllers, or just your standard computer keyboard.

    Cost / License

    • Free
    • Proprietary

    Application type

    Since

    • Since 2018

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    Clone Hero screenshot 1
    Clone Hero screenshot 1
    31 alternatives