My macbook pro is really slow... what can I do, are there any online softwares that can fix this?

Installed any anti-virus application?

Try suggestions made in this article.

http://support.apple.com/kb/PH3915

There is no application available to speedup performance of a Mac.

Best.

Why is my computer slow?

Liti wrote:

My macbook pro, is very slow, ...

Check that your Hard Drive has sufficient Free Space...

Read Here > Why is my computer slow?

Liti wrote:

... Are those clean my mac softwares any good?

Not really...

To keep your Mac happy... See Here...

http://support.apple.com/kb/HT1147

http://www.thexlab.com/faqs/maintainingmacosx.html

Mac OS X: About background maintenance tasks

http://www.thexlab.com/faqs/performance.html