There are 3 repositories under kubernetes-applications topic.
A management framework for extending Kubernetes with Operators
KOTS provides the framework, tools and integrations that enable the delivery and management of 3rd-party Kubernetes applications, a.k.a. Kubernetes Off-The-Shelf (KOTS) Software.
[DEPRECATED] Assign Azure Active Directory Identities to Kubernetes applications.
Generic libraries for building idiomatic Kubernetes controllers
Define Kubernetes native apps and abstractions using object-oriented programming
Managing the lifecycle for a group of operands