M-Trade Pro  (J-trader)   - Mtrade Pro is a feature-rich front-end application that can meet the needs of all types of trader. It is a highly flexible product that allows you to choose the level of functionality to suit your requirements.  A Patsystems product.
Opinion: Very easy to use with simple and effective display for execution. 
Cost:  50 cents per trade data fee.
Electronic markets only.

NinjaTrader   -Order creation and management  can be a time consuming and erroneous process especially when trading fast markets, with NinjaTrader, the order execution process is efficient and accurate providing you the edge you need  to succeed.
Opinion: This is a front-end upgrade to J-trader.  Allows for auto-entry stops and target orders. 
Cost: : $49 per month charge, plus 50 cents per trade data fee.
Electronic markets only.

M-Trade   - Mtrade has been designed to afford traders access to the US futures markets.  This browser based entry system allows users to access and trade both electronic and open outcry markets.
Opinion: Browser based application, so it's available anywhere internet is for you.  No market depth or any other bells and whistles, but very effective and easy to use for electronic order entry and management of any market.  Users enter symbols into platform for each trade. 
Cost:  No fee for MF Global clients.
Electronic and Pit traded markets.

ManXpress  - An advanced platform that can be utilized as a java based software application or browser based system.  Provides order entry, quotes, and account balance information all in one.
Opinion: Provides the most function out of all the platforms enabled for both electronic and pit trading.  More complicated than most to get use to, but once you do, very capable and efficient. 
Cost:  No fee for MF Global clients.
Electronic and Pit traded markets.

X-Trader  (Tech Trader)   - A high performance software for professional derivatives traders. Designed for quick execution with a single click.  Very good auto-spreader tool.
Opinion: More product than needed for most speculators.  Largely a professional system.  [
Cost:  Starts at $700 per month fee.
Electronic markets only.

PhotonTrader   - PhotonTrader is a professional level trading platform designed for those who demand more out of each trade.
Opinion: Very fast.  May be more than average trader needs however. 
Cost: $200 per month fee.
Electronic markets only.

Strategy Runner   - Strategy Runner is a sophisticated yet easy-to-use trading platform that provides ability to trail stops, auto exit, and more.
Opinion: Trailing stop-loss feature is nice, but not as fast or stable as others.  
Cost: 75 cents per trade data fee.
Electronic markets only.

eSignal   - One of the newer platforms to become available. Combines real time data for charting with a flexible trading platform.  A variety of free indicators included.  Users are also able to develop and test their own systems.
Opinion:  A bit pricier for users, but provides the best of both worlds for data and execution.  Great set up for an active trader.
Cost:  $44.95 per month.
Electronic and Pit traded markets.

Trade Navigator   - A Genesis product, it offers advanced charting, real-time PnL, and market depth. 
Opinion:  Offers charting and trade execution from a single program.
Cost:  $59 per month.
Electronic and Pit traded markets.