Computer Room Design

I am planning to finish off my basement with a entertainment space, laundry room, and bathroom and would like some software to design the walls, spaces, and layout.

I was just curious if theres a site,free software etc. That provides Graphics that a architect would use on blue prints? Or any other sites,software that i can use as an independant handyman/carpenter/ambitious general construction laborer

Is there a piece of software I can install that will help me design a room? I know there are a lot of free ones on websites, but one of things I don’t like about them is that there’s no way to save your settings.

I’ve just measured out all the dimensions of my bathroom, and I’d like to save that somewhere. Any ideas?

I don’t mind if it’s free or costs money.

Cheers!

I’m desgning my own house interior and wood work, which includes the furntuire drawings(wardrobes , wall units), palcement in room, and colour scheme, Which are the best tools available on internet (free ofcourse ;)) to help me? I will more interested in tools which can show me 3D picture with colour scheme and may be some build-in components (like room, wardrobe)
Thanks!