back testing via replay of past options data

is there a broker / other that allows "free" backtesting of options data? so we can try different strategies?

 

Thinkorswim does, I think.

 

Don't bother unless you have historic quote data. Testing against last print data will not provide meaningful results.

 

tos require the account to be funded, is there one which dont?

back testing is useful, to see if a strategy would work in the situation

 

Well, you could use Excel for backtesting. But it requires you be familiar with Excel, requires some time to set up, plus access to historical data.