Hi I want to shift to Mac OS X , I wanted to know whether there are any similar development tools like VS,asp.net,.net frameworks are available in Mac OS X or not? I mean how does one can compete with windows with the same results those of microsoft? Are there any extra software availble or where can I find them? Thanks.
If you insist on using .net, the mono project is an open-source C# implimentation.
But really, the way not to get stuck in this kind of mess is to use standards instead of programming in Microsoft's design-fad-of-the-week.
And also check out some items listed here:
http://osx.hyperjeff.net/Apps/apps.php?f=integrated%20development%20environment
Some more hints what Mac OS X has to offer:
Dumbarton
ObjC-C# bridging framework
http://developer.apple.com/business/macmarket/imeem.html
Creating Mac OS X applications with MS Visual Studio Express (article)
http://mac.sillydog.org/dev/visual_studio.php
Visual Web Developer on a MacBook
http://aspadvice.com/blogs/rbirkby/archive/2006/07/16/19704.aspx
http://fastfin.net/seamless/
Cross platform development for Windows and Mac OS X (article on Qt)
http://www.regdeveloper.co.uk/2006/11/19/cross\_platform\_development\_win_mac/
MinGW
build Windows applications from within Xcode
http://www.zonic.co.uk/products/mingw/
Some Mac counterparts/alternatives include:
Apple's Xcode & WebObjects development tools (IDE)
http://www.apple.com/webobjects/getting_started.html
MyEclipse Enterprise Workbench (IDE)
Komodo (IDE for PHP, Python, Ruby, ...)
RubyOnRails installer package
http://locomotive.raaum.org/
Right Way to Install Rails on Mac OS X?
http://theocacao.com/document.page/321
Rails 101 for Microsoft Developers (article)
http://softiesonrails.com/2006/09/13/rails-101-for-microsoft-developers
http://www.themolehill.com/index.php/2006/07/14/welcome-to-the-dark-side/
EnterpriseDB (based on PSQL)
LiteSpeed Web Server Enterprise Edition
http://litespeedtech.com/products/webserver/download/
macstl (C++ library)
GLFW
portable framework for OpenGL application development
http://glfw.sourceforge.net
LANrev
cross-platform client management
http://www.lanrev.com/
A Mac Business Toolbox (article)
http://cutedgesystems.com/weblog/Tutorials/OfficeMac.html
Some minor goodies:
WinShortcutter (Windows shortcuts utility)
http://www.lobotomo.com/products/WinShortcutter/index.html
DefaultKeyBinding.dict (emacs-like keybindings for Cocoa apps)
http://beebo.org/stuff/mac/
Switcheroo (Windows-like taskbar)
http://software.carsonbaker.org/
Cheers,
Verno
thanks a lot. 
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It looks like they're giving away an xBox 360 and the Gears of War game every week until 12/15. Pretty cool game.
Link removed.