server

It's written against .NET Core which is cross-platform, however a handfull of the project's libraries haven't been ported to Core from the Full framework yet. See: https://github.com/bitwarden/core/issues/3 Additionally the DB Backend is MSSQL which "is" linux compatible (kind of), but if the author addresses this as well: https://github.com/bitwarden/core/issues/10 Then it should be runnable pretty easily on linux. So it isn't cross-platform yet but it seems that's part of the plan.

While that is true (and I agree in principle), I'm actually fairly sure that a promise "the current license is GPLv3" is as legally binding as actually putting the license file in the repo -- since it's a statement by the copyright holder of the licensing. The wording wasn't "we might license it under X", or "I'm considering licensing it under X". The exact wording is: > I'll have a license added tonight at some point. It will be GNU GPLv3. Which to me reads as "I'll have a license [file] added tonight...". But meh, that's for courts to decide not random people on the internet cosplaying as lawyers. EDIT: This is all moot anyway because the author did end up using GPLv3[1]. [1]: https://github.com/bitwarden/core/blob/master/LICENSE.txt

This is an ASP.NET Core application, however, it references the full .NET Framework currently (instead of .NET Core which is full cross platform). I am working to make it run on .NET Core but it requires some third party library dependencies to be addressed first. This is being tracked here https://github.com/bitwarden/core/issues/3 . I anticipate this to run on .NET Core in the near future and therefore be truly cross platform for Windows, Mac, and Linux.