I filled out a submission on the poll, even though I haven't been involved with any of the pokeforumgames (other than Pokewolf). I actually have a Showdown tab open in my browser that I've halfway assembled a couple of teams in, but haven't actually used for anything other than testing out the system by playing against myself in another browser.
Oh, somewhat related: As I've been playing through Emerald (thanks Dylan... I'm never getting those 30+ hours back), I've been making some incremental changes to my
type analysis spreadsheet. Notable changes: I moved some things around on the Team Builder sheet so that the total immunities/weaknesses/whatever only apply to your party pokes; I added a snazzy color-coded base stat lookup feature; and I also added fake Pokemon to the list of pokes with every possible type combination, so if you ever want to look up how a Normal/Steel poke stacks up typewise, you can just type Normal/Steel into the name box. Handy when I run into a Marill in Emerald- they weren't Water/Fairy types back then.
Y'all are free to copy this spreadsheet in your own Google Drives so you can analyze your teams in Showdown or whatever.