Option Vue http://www.optionvue.com Option Insight http://www.optioninsight.com OpenInterest http://www.rpsw.com OptionPeer http://www.optionpeer.com Optionstar http://www.optionstar.com Hoadley http://www.hoadley.net Optionetics http://www.optionetics.com Optionsxpress http://www.optionsxpress.com thinkorswim http://www.thinkorswim.com Bay Options http://www.bayoption.com Tradestation's Optionstation http://www.tradestation.com/optionstationSuite/OptionStationSuite_overview.shtm Interactive Brokers http://www.interactivebrokers.com/en/main.php I Volatility http://www.ivolatility.com 888options http://www.888options.com
http://www.elitetrader.com/vb/showthread.php?s=&threadid=34974 http://www.elitetrader.com/vb/showthread.php?s=&postid=1062129#post1062129
OptionVue seems to be the only one that supports ASCII. http://www.optionvue.com/help/Line_Format_ASCII_Import.htm The problem is, you can't find a working OptionVue, and you probably won't find history option chain stored in ASCII format.