Interactive Brokers (platform and broker)

www.interactivebrokers.com
Allows lots of connectivity for outside platforms, no built-in algo tools, all third party, has options
Software List
www.interactivebrokers.com/Universal/servlet/MarketPlace.MarketPlaceServlet
Charting
https://gdcdyn.interactivebrokers.com/Universal/servlet/AccountAccess.AuthenticateSSO?action=ACCT_MGMT_MAIN&loginType=1&clt=0
Chat
http://chatsrv1.interactivebrokers.com/fchat/chat/flashchat.php
Elite Traders might be a good user forum https://www.google.com/search?sourceid=chrome-psyapi2&ion=1&espv=2&ie=UTF-8&q=elite%20traders&oq=elite%20traders&aqs=chrome..69i57j0l5.3711j0j8

Multicharts .NET version (algo, options support limited)

https://www.multicharts.com/net/purchase/ Support is excellent. I thought this was hands down best charting platform found as of 4-5-2017 Sierra Charts is better according to write-up by friend of JC who said “when a symbol does not have enough history on the chart, the script gives an ‘ugly’ error message and doesn’t calculate anything” and said he experienced this in Multi-Charts. I think he was using the EL version though as he also complained of speed issues in general, and both complaints about multi-charts (bar history and speed), were general comments about other platforms as well. Since speed and other issues are greatly affected by the programming language, I suspect that Multicharts .NET version which compiles strategy rules using C#, would handle this just fine. I plan to test as of 9-7-2017

Quantshare

options support clearly stated on page
support@quantshare.com
full platform with rule based builder, free trial, might be web based
https://www.quantshare.com/how-423-how-to-run-a-screen-or-a-watchlist-from-a-script
Could provide some chat functionality, does have strategy building; Lifetime pricing looks reasonable https://www.quantshare.com/index.php?option=quantshare&amp%3badd=; never responded in forum.

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