^ You are correct. Blackbox stopped being developed several years ago. Fluxbox, openbox, and a couple others that are no longer maintained were forked from blackbox.
If the OP really wants to decrease window manager resource usage, he can try using openbox without any 3rd party panels, or try another window manager like cwm, evilwm, flwm, or tinywm (default for Crux linux, I think) - none of which have native panels, but are EWMH compliant so you can use tint2, lxpanel etc ...; of course, there will be a decrease in features - like no window decorations - that he will need to deal with.
Jwm might suit your needs, Oday. It is similar in appearance to fluxbox, and has a native panel with systemtray - I posted a screenshot of the recent version in the screenshot thread. I think htop is running in that shot so you can see the resource usage.