The best advocacy software is Salsa Engage(a software created by Salsa Labs). This software helps organization or companies to easily organize the community, mobilize activists, and also win legislative fights. In this software, companies can also easily send messages to targeted lawmakers and enhance the company’s social advocacy.
There are a lot of different advocacy software that people can choose from such as "Muster",(which enables companies to easily communicate with lawyers so they can advance their cause) and AdvocateHub (helps different companies to nurture, discover, and mobilize fans so that they can be able to shorten the cycle of sales and amplify their marketing strategies)