Thank you for your feedback. Having the platform logos on the list is a great idea, so I've added them to the list.
I'm still thinking about the categorization structure. I want to keep the number as low as possible, but yesterday, it appeared that the current categorization by output type (text, image, etc.) doesn't work well for some tools, especially those related to sharing and communication.
$ sign is again a good idea. Maybe I can add new tags like, free, freemium, ads etc.
I have fixed the Firefox issue. As for SyncThing and similar file sync/sharing tools, they're currently a bit tricky to categorize since they can be used to share all kinds of file types. Maybe I can create a dedicated category, but still not sure. Do you have any suggestions?