Someone guide me how I can share my AX 2012 R3 table data with other system (like websites, console applications etc.)
Also guide me or share with me any sample code how I use AX shared data in external systems.
Thanks in advance.
AX 2012 offers AIF document services and custom services for this purpose.
Document services are intended for CRUD operations on (possibly very complex) documents such as sales orders.
Custom services allow exposing individual methods. You can return complex data contracts from them, but they're intended for operations accepting and returning quite simple sets of data.
Check out the links for more information.