Software for converting image files

[zanara]

I don't know if I post this problem at right page. But who can suggest me any software that help convert file .png and .ico to .jpeg and via versa? Where and which version of that software can I download? Thank you

[Broco]

What do you think?
Is this the page about a groupware server the right place to post questions how to convert images?

This is the right place.

[Martin Heiland]

http://www.gimp.org/