Currently I'm working with SamKenne's Casting mod. I believe it is quite amazing on its current state.
It can inform you on when navy, land or air facs are first made, when a higher tech is achieved on either of these, mass invested into any type of unit (no more having to check ASF, t1 tank or frigate numbers! You get a clear picture of who has more or less mass invested into those units in REAL TIME), it also obviously gives you mass production, reclaim and total mass values! It needs some love on the UI department but functionally it's pretty crazy in my opinion.