Useful freeware for OS-X : screen capture, pdfill, AV, partition magic

Just got a Macbook Pro (retina).

Where can I download some useful freeware for OS-X (Mountain Lion):

a) a screen capture utility (equivalent of Windows SnagIt) which could
    save the captured screen as jpg, png, bmp & possibly PDF formats?

b) print to a PDF file (equivalent of PDFill / image writer) printer

c) is virus infection common on OS-X (compared to say Linux) as this
    laptop will be accessing Internet almost daily?  Where can I
    download  a copy of free AV / anti-malware (which doesn't take
    much system resource when it's scanning) ?

d) partition magic equivalent tool to format an external USB HDD
    (to a format recognized by OS-X) & which could sort of adjust
    dynamically the USB HDD partition sizing as & when needed

e) a tool that allows me to auto-mount & read files on NTFS partition
    of a USB HDD as well as map drives of a Windows XP/7 shared drives
    (via Wifi if possible as I hv a number of Windows laptops at home)

f) as the Macbook comes with a built-in camera, a software that could
   capture/convert videos into numerous video formats ( .wmv, VCD,
   DVD, rmvb & quicktime )
sunhuxAsked:
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sunhuxAuthor Commented:
h) does OS-X comes with a DVD burner software?  If not, then
    suggest a freeware that could perform burning/writing to
    DVD (like what Nero in Windows could do;  I know Nero is
    not a freeware)
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strungCommented:
Most of what you want is built in to the Mac:

1. Screen capture:  http://graphicssoft.about.com/od/screencapturemac/ht/macscreenshot.htm

2. To print to PDF, pull down the File menu to Print, and select PDF from the bottom left corner of the print dialog box.

3. Mac viruses are almost not existent. If you feel obliged to us AV software (and I don't), here is a list. Several are free:  http://download.cnet.com/mac/antivirus-software/

4. Use Disk Utility, found in /Applications/Utilities to format disk as Mac format.

5. Write to NTFS volume: http://www.macupdate.com/app/mac/24481/ntfs-3g

see also:  http://lifehacker.com/247148/how-to-mount-a-windows-shared-folder-on-your-mac

6. Imovie and IDvd on the Mac.

7. How to burn a DVD: http://www.online-tech-tips.com/mac-os-x/burn-dvd-mac-os-x/
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strungCommented:
Suggest you look at the video tutorials here:  http://support.apple.com/videos/#macosandsoftware
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