Aptify is a meta-data driven development platform built on Microsoft SQL Server and .Net Framework. It primarily targets itself as the all-in-one Association Management System (AMS) for Associations and Unions. I've been using the platform my self since 2007 at 4 different associations and 5 years as a consultant.
Here at my personal top 5 features of Aptify.
Client App
Not just a basic CRUD/Dashboard application or just an Admin data management app. The OTB client application supports all activities for end users, administrator and developers.
Views
Empower all users view your data they way they need to for day-to-day operations. Users can access any entity/table data that they have permission to and create any list (table), charts, calendar, maps and card views they need.
Form Templates
Customize your individual record templates to meet the needs of your organization and make day-to-day operation easier for staff. Use the OTB pre-build components or build your own.
Process Pipeline
Aptify event based system for Validation, Before and After Save, Asynchronous, Synchronous and much more. Implement any business logic you need to meet the demands of your organization. Supports VB.Net scripting, SQL scripting or compile your own components in a .Net library using Aptify's massive .Net based framework (SDK).
API (eBiz Soa)
Known as eBusiness, it comes all ready to go to deploy a pre-built membership portal with login, eCommerce (products, memberships and event registrations), User profiles, donations, company administration and more. On the developer side a meta-data driven API system that is full integrated with entities and the process pipeline to extend and build the apps/service you need.