Need PowerPoint or alternative download

I need a Powerpoint or alternative software download for school. If anyone knows where I can get sumthin, lemme know plz.

openoffice is pritty much a free version of microsoft office puls some extras i belive their version of power point is impress. i dont think u can just download one thing but here is there site.http://www.openoffice.org/

rember if u want to open it with power point later on u have to do save as and change the format to .ppt

k. it worked well for what I needed! thx, amir!