Altbee now supports filtering by tag—yes, really. Check it out: go to the Beeminder tags page, add tags according to whatever categorization schema or taxonomy you feel is best, then you’ll be able to filter your Altbee dashboard according to these tags.
A few related threads: [1], [2] (discussed in more detail later in that thread), and also various threads about organizing goals: e.g. [3], [4], [5].
In the past, I said a few times [1], [2], [3] that I needed API support for tags before I could implement this feature—but it turned out to not be that hard to do the impossible and fetch tags even without such support. I still really would like formal tag support to be added to the API, if only so that I can remove the somewhat dumb and hacky workaround which I’m currently using behind the scenes.
Not that for now at least, Altbee can filter by your tags, but not add them. So to add or edit your tags, you’ll still need to visit the official Beeminder tags page, which isn’t particularly easy to find. So I suggest bookmarking it or the like, or simply remembering the URL (not actually that hard!)