Gecko's Track n Trade EOD for futures charts includes seasonal patterns.
Ove the last couple of years they have introduced TradeMiner for Forex, Futures and US Stocks.
These are the best seasonal tools I have come across.
I consult them every day for Forex and Futures (Forex is much more seasonal than most people imagine). If the daily or weekly chart is telling you the same as the seasonal prediction then you have a high probability trade in my experience, but it requires a bit of practice.