OpenWF is a software suite centered around customizing Warframe, including:

• SpaceNinjaServer — an open-source reimplementation of the game's web services. As we have custom server software, OpenWF avoids interference with the live game while allowing full customization of savedata.
• The Bootstrapper — our main DLL targeting the latest game version. Its core precept is connecting to custom servers, but it also has some QoL features and cheats as well as a scripting API, label replacements and metadata patches, allowing for extensive customization of the experience.

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Preservation

OpenWF works entirely offline, so the versions supported by OpenWF will always be available to play and revisit, and it is indeed already possible to revisit old versions.