If you are a ham interested in HF, you've probably heard of HamClock. Elwood Downey WB0OEW created it in 2017 based on an arduino and dedicated LCD display. He wrote an article in QST magazine, based on which I created my own. I've had a HamClock running ever since.
The HamClock connects to a backend server to get its data. Elwood had maintained a server at clearskyinstitute.com/ham/HamClock.
Sadly, Elwood passed away in Jan of 2026. While the HamClock client was fully open source and MIT licensed, the backend server was not available. According to Elwood's post, clearskyinstitute.com would stop functioning in June 2026.
I immediately wondered if I could create a backend. Boy, I didn't appreciate the complexity of that at first. I connected with Brian who had already made create progress creating source code for a back end. I jumped in to dockerize it and make it easier for people to host their own. It's fully open source and AGPLv3 licensed, and can be found here: https://github.com/openhamclock/open-hamclock-backend.
By around April or so Chris, G1FEF, joined us and contributed servers in his data center to host https://ohb.hamclock.app. He also set up OHB Works where we can track the deployment of the backend, development of the backend and development of the client.
By May or so, Brian and I had OHB (Open HamClock Backend) feature complete and we had a few hundred users connecting to ohb.hamclock.app.
Shortly after we started working on HamClock and created a GitHub for it at: https://github.com/openhamclock/hamclock And Udo N0LSR joined in to rewrite and expand the user guide.
At first it was in my GitHub account but then we set up a GitHub organization and have multiple other projects supporting HamClock: https://github.com/openhamclock
Recently we have ported the client to Android and published it in the Google Play and Amazon App stores. Amazon introduced a non-android tv streamer with Vega OS so we have a vega port in beta at this time. We've got support on MAC OS (natively) from Hubert KF0VWD and Roku (via a viewer). We have started an iOS port but need a real iOS app developer with dev tools and an Apple store account to complete the port.
Give HamClock a try!