Filters will be added as soon as possible, but the backend API currently doesn't support it. In the meantime, @jesta's site does make some filters available:

Thanks @roadscape, steemdb seems to have/had some broken functions so I sopped using it a little while ago. What I did like there (although could be improved and they often don't work) are the graphs to track account activity. I like the idea of being able to see progress of growth visually.

Keep up the good work, the more tools the better :)