What are some alternatives?
Wild Apricot - Wild Apricot is a membership software with friendly and knowledgeable support.
Sheep - Membership and events for SMEs and nonprofits
GroupSpaces - Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Zenbership Membership Software - Open source membership software that combines event planning, CRM, a CMS, invoicing, subscription...
Membee - Membee is web-based membership management software.
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.