Based on our record, Sling should be more popular than Kapow. It has been mentiond 7 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.
Using Sling (https://getsling.com/) for a distributed CS team. It's working pretty well. We're spread across six timezones, been using it for five months. Free version's done well enough for us. Source: almost 2 years ago
If you want to try a free product, Sling scheduling app is good. You can google the reviews to see if that match your needs. Source: about 2 years ago
But I think you might want to look at some more dedicated scheduling software like Sling. Source: over 2 years ago
I've used Sling with my guard team. It's primarily a scheduling app, but it also has messaging functions. Source: over 2 years ago
I suggest https://getsling.com it's not open source but the free version is really good. Take a shot at it. GL. Source: almost 3 years ago
When I've needed to do this I've used Kapow in the past. Kapow: https://gottcode.org/kapow/ Depending on the projects sometimes it was a specific allotted hours but some projects would feed into the next project and I would want to capture the actual hours as I knew it would exceed the "estimated" hours of work. Prjoect Managers can complain but sometimes its a guess as to how long things actually take. Source: over 2 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.
Kimai - Kimai is a free open source timetracker.
Deputy - Deputy is a software for employee scheduling, time and attendance and communication management.
Project Hamster - Project Hamster is time tracking for individuals.
ResourceGuru - The fast, simple way to schedule people, equipment, and other resources online.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.