Is there a freeware alternative to Tableau 8? One that allows me to use my own data (shapefiles)? Tableau is a comercial software that permits you to create a dashboard were you can show at same time maps e diferent kind of graphs. Besides it is very limited for a GIS, it could be very useful to make simpler visual analysis and communicate results in a interactive environment. As my specialty is environmental analysis, like vulnerability analysis, my main interest is to find a tool to communicate the results and that allows anyone to do simple analysis, like correlation graphics (see the link for example http://esl.jrc.ec.europa.eu/). There is some tools in the market but or they are expensive, or they do not permit that you use your own data.
I think you have a few options.
1) ArcGIS online if your data are limited and you just want to get it online (they have free limited use for individuals).
2) Mapserver if you need something more robust and are more server focused.
3) Leaflet if want you want is more mobile.
But as whitebox says, it depends exactly what features of Tableau you want (want an awful link for a commercial product, a complete lack of information).