I have ADHD and have issues focusing on what I have to get done.

I am searching for a app such as this one where I can focus for a specific amount of time (like a pomodoro) but that stays on top of other apps. Does anyone know any FOSS app that is able to do such thing?

I am currently using Logseq with the Pomodoro timer plug-in.

In addition, what apps are you currently using for productivity? I am not talking about specific work tools like code editors. I currently use Logseq/Anytype (trying to transfer a few things to Anytype as it has support for templates). I tried using Vikunja but I didn't like it very much, we still use it for home management as it has support for recurring tasks.