Geometry freeware to make my life easier?

[Gautama2]

I want something where I can just give it points, and it will plot it on a coordinate plane for me.

Be nice if it also had options such as "Find orthocenter, centroid, circumcenter" and other geometric parts.

 

[Gautama2]

Nothing?

 

[WildHorse]

A)
Graphinity is a graphing application that produces graphs of user-entered mathematical functions in 2D, perspective 3D and anaglyphic 3D (meaning with visible depth ? see the first image on this page). The only desirable accessory is a pair of anaglyphic glasses, with red and blue lenses. Graphinity is free and is released under the GPL.

B)
This JavaScript application will compute commonly needed properties of regular polygons.

C)
Polynomial/Trig Regression Data Fit

D)
Quadratic Equation Solver

Plenty more out there if you search.

Try a free trial download of Mathematica if you want more.Here's a place to start with that