There are various measures and promotional instruments put in place by the Federal Government that can be taken advantage of. These are shown in the chart below, which is provided by the Federal Ministry of Finance.
Other helpful links
Information on the online application for short-time work compensation: https://www.gvw.com/aktuelles/kurzarbeitergeld.html
The KfW Corona Aid offers loans for affected companies: https://www.kfw.de/KfW-Konzern/Newsroom/Aktuelles/KfW-Corona-Hilfe-Unternehmen.html
The Federal Ministry of Economics and Energy describes the immediate measures to strengthen the economy: https://www.bmwi.de/Redaktion/DE/Dossier/coronavirus.html
Helpful information for tourism companies can also be found in the Corona Navigator of the federal competence centre for tourism. There you will also find information on state aid provided by the federal government and the federal states for companies in need: https://www.deutschertourismusverband.de/service/coronavirus/hilfsangebote.html
The Federal Ministry of Finance is launching an aid programme worth billions: https://www.bundesfinanzministerium.de/Content/DE/Standardartikel/Themen/Schlaglichter/Corona-Schutzschild/2020-03-13-Milliarden-Schutzschild-fuer-Deutschland.html