Based on our record, Deputy should be more popular than Apache Karaf. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
A quick search yielded https://wheniwork.com/l/employee-scheduling and https://deputy.com. Not self hosted but seem like they would fit your needs. The latter might cost but I guess you can reach out to them for non-profit discounts perhaps. Source: over 1 year ago
Use deputy.com and switch to all breaks are unpaid. Clock off for any break longer than short toilet break. Source: over 2 years ago
Apache Karaf with OSGi works pretty nice using annotation based dependency injection with the declarative services, removing the need to mess with those hopefully archaic XML blueprints. Too bad it's not as trendy as spring and the developers so many of the tutorials can be a bit dated and hard to find. Karaf also supports many other frameworks and programming models as well and there's even Red Hat supported... Source: about 3 years ago
When I Work - When I Work is an employee scheduling and communication app using the web, mobile apps, text messaging, social media, and email.
Docker - Docker is an open platform that enables developers and system administrators to create distributed applications.
ResourceGuru - The fast, simple way to schedule people, equipment, and other resources online.
GlusterFS - GlusterFS is a scale-out network-attached storage file system.
Sling - Sling is a free shift scheduling and communication software. It is built around four main features - shifts, messages, newsfeed and tasks, making it possible for managers to organize all aspects of their work on a single platform.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.