Treezzy.com

Comprehensive, easy to use and not a major time investment. You get a little bit of the best of all worlds with this planner. 

This is another quick estimate tool that is easy on the eyes from a design perspective and very simple to use. It offers a 'retirement life cycle' approach to your asset allocation and applies on your behalf. 

A quick-estimate style calculator with an elegant design, multiple ways to simply adjust assumptions and links to plenty of resource articles.

This calculator is a quick way to play out several multiple portfolio scenarios using a Monte Carlo Simulation, while providing insights and prompting what-if scenarios. After performing an iteration, it features a chart depicting each possible scenario. 

A complete personal finance package that handles all the details and features a neat timeline view, this tool requires a time investment and a download to your machine. However, if you have the time and don't already have a way of tracking your on-going budgeting, tracking and 'retirement forecasting,' this comprehensive tool certainly covers it all.

A planner focused on scenario analysis, it is efficient in design while still being thoroughly flexible and robust in the factors it allows you to address.