I want an editing software ,from where to download?

Wax -- a high performance and flexible free video editing software program. Wax is good for both home users and professionals.

http://www.debugmode.com/wax

Zwei-Stein -- a great free video editing software, but the user interface is very technical. It is full featured, offering many different effects. There are up to 64 effects, which can be chained serially.

http://www.thugsatbay.com/tab/?q=zweistein

Avidemux -- a free video editor designed for simple cutting, filtering and encoding tasks. Trim, add filters and even encode video. You can remove the audio portion of a video file, or remove the video portion and retain the audio part, among others. You can even reformat and resize your videos.

http://avidemux.sourceforge.net/

VideoSpin -- user-friendly and allows you to drag and drop your multimedia clips (video, images and audio) to the program’s timeline. Editing features include transitions, sound effects and cool titles. Create scrolling titles, a feature usually found only in expensive software programs.

http://www.videospin.com/redesign/default.asp

VirtualDub -- may lack the editing power of a general-purpose editor such as Adobe Premiere, but is streamlined for fast linear operations over video. You can take a captured clip, trim the ends, clean up some of the noise, convert it to the proper frame size, and write out a better one. Remove and replace audio tracks without touching the video. It has extensive video filter set, including blur, sharpen, emboss, smooth, 3x3 convolution, flip, resize rotate, brightness/contrast, levels, deinterlace, and threshold.

http://www.virtualdub.org/

What kind of media? Pictures? Animation? Video? Audio?

Tip; Google "Utorrent", download & install it. Then search for any software you want followed by the word "torrent" in google. Then, after opening one or two of the search results links, look for any link which says get torrent file. (usually a small green downward pointing arrow in the link name). Download the small text file pertaining to the software you want, then open it. Utorrent will do the rest for you.

There are also some very good quality freeware programs available. If you're just starting, I suggest starting with them before spending your hard earned cash.

If you have an idea of what 'paid for' software you want. Just go to:

http://alternativeto.net/

Type in the search box, the name of any expensive software you want. Click search & "alternative to" will find you all the equivalent 'free' versions of that paid for software & give you a comparison to the paid for version.