git was designed to be decentralized. Everyone can (technically, but it is not too hard to set up if you have some affinity with servers) fork/clone another git repository and serve it up. It has built-in ways to synchronize with any other server. In fact, that synchronizing is what most developers do when they use git.
Of course, that would make it harder to know which repository has the “official” version, but in a way, that is maybe also a benefit of decentralisation. Knowing what code is authentic can be done by signing the commits.
The hubs that we see, are usually a combination of git and a way to serve the code, along with documentation, roadmap, bug tracking, automatic testing and building and the resulting binaries in a visually pleasing way. That does not need to be a part of decentralizing the code, and it is not the only way to do it.
Some of that can also be done with git built-in tracking of files, and the building and testing can probably also done in other locations, as long as there are files describing how to do that bundled with the code (which practically all projects already do).
Sourcehut (https://sr.ht) is one hub that helps developers use simpler tools for those workflows, and I think that’s a good place to find some inspiration.
I do my time tracking in org-mode, and export it to JIRA once a day or so. It is quite a specific/tailored setup, written in a mix of elisp and, well, org-mode (specific names and tags are used to configure some settings), but I’d love to look at this tool to see if I can extend my workflow by using it for the “massaging into a nicer shape” part. I might end up writing some extensions for either side (org-mode input format and JIRA REST calls output format).
My current tooling quantizes everything by rounding start and end times to the nearest full 15 minutes, and starting a new task at the end time of the previous one when clocking in, so that my team lead does not have to report so many fractions of hours to higher layers.