Many companies provide matching funds for retirement accounts, but don't allow you much say in where you invest. You can be given a basket of stocks and told to pick, or told which fund managers you're allowed to use.
That aside, individual investors usually like their current funds and are loathe to leave them just for something that promises better results.
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What I envision is a site that simplifies the current technical and quantitative trading tools into something usable by the common trader.
That way if your company says pick from stocks A to Z to invest in June, you can decide which stock to pick. For example, don't pick A because seasonal trends dictate they always fall 8% in June. Or don't pick B because it is overbought because it is nearly touching a resistance band and has only broken resistance once in the past 5 years.
My examples are from technical analysis, but quantitative techniques work just as well.
The tools available are good, but require a lot of theoretical knowledge before use.
For a common investor, using a algorithmic tool with fewer options, sensible defaults, and automatically applied backtesting would be a huge step upwards from listening to Fast Money or the musings of their coworkers.