I found some On-line tools are quite useful to all of you.

EditGrid : www.editgrid.com/home
Like EXCEL
PDF online : www.pdfonline.com/convert_pdf.asp
Get picture from PDF file :- www.rivision.com/pdfwiz/about.asp
Online calendar : http://30boxes.com/
On line powerpoint : http://www.thumbstacks.com/
Media-Covert : http://w10.media-convert.com/
Zip tool :- http://www.altools.net
Security : http://www.nanoscan.com/
http://www.kaspersky.com/scanforvirus/
Advistment act : www.tvcmbase.com