Austria

In the event of a no-deal Brexit, UK nationals living in Austria would lose their right of residence under EU law. In this scenario, a special legal regulation will enable UK nationals and their third-country family members in Austria, to obtain a residence permit under the Settlement and Residence Act (Niederlassungs- und Aufenthaltsgesetz) with free access to the labour market under simplified conditions.

https://www.gov.uk/guidance/living-in-austria

https://www.bundeskanzleramt.gv.at/en/topics/brexit/residency-and-access-to-the-labour-market?lang=en