is there free alternative for primavera portfolio management

no primavera is the only professional program for planning, scheduling, controls & project management

The Primavera P6 provides project portfolio management solutions---including resource optimization, cost reductions and enhanced business decisions---for industries that are project intensive.
There are free online training resources that review the general aspects of working with this software as well as specific software features.
Read more: Free Primavera P6 Online Training | eHow http://www.ehow.com/info_7819230_primavera-p6-online-training.html#ixzz2WMTX0vZq For more details please go through the above given link.

A free alternative may not have the same capability of Primavera P6 Portfolio management. You can find some free softwares but they may not meet your requirements. If you want to try the free trial version you can follow the steps written in the article below.

Primavera Portfolio Management