OBS LiveSplit Plugin
If you use LiveSplit One and want to show it on stream, but find it annoying to open a separate window with https://one.livesplit.org or livesplit-one-desktop, then you can use this OBS plugin which will directly render your splits as a source in OBS. It supports autosplitters, and live reloading for both the splits and layout, so you can edit those on the fly without having to reload the plugin or restart OBS. If you don't use an autosplitter, you can set your hotkeys for split/reset/etc. under Controls>Settings>Hotkeys (probably at the bottom of the list).