https://sequencediagram.org/ is the best text-to-sequence-diagram tool. Its the only one of these which lets you draw sequence diagram with your mouse too and will generate text accordingly. Completely offline (localstorage) and also supports saving to onedrive and google drive.
This is insanely good, thank you very much for the link! Should be a great tool to "bootstrap" some diagrams during brainstorm meetings, or just to put into documentation, and be able to change them later.
