Third party add-ons are already happening with the addition of a Syrinscape API. There are other 3pp connections that are in the road map, including: Combat Manager, PCGen, OneNote, Realmworks, and World Anvil to name a few. Most integrations will be happening in v0.3.6.
Hope that helps! If you have ideas for other integrations, feel free to request them here, on the FB page, and, most effectively, in the Discord channel. There are links to the FB and Discord channel right on your Launcher, just above the YouTube video!