The ABA’s Legal Technology Resource Center is an amazing wealth of information for attorneys. They also keep and compile a list of known vendors. Since software providers constantly change features and pricing, we recommend using this guide as a starting point for your investigations. It is very difficult to keep charts like this constantly up to speed:
Practice and Case Management Software Comparison Chart:
https://www.americanbar.org/groups/departments_offices/legal_technology_resources/resources/charts_fyis/casemanagementcomparison.html