Paramasivam.M,
You can certainly leverage the Web Services API to add information to Agile Central or get information from Agile Central. Of course it is limited to the Artifacts and Fields available on those Artifacts in Agile Central. You may see all that is available via the Web Services API documentation at:
https://rally1.rallydev.com/slm/doc/webservice/
And for further information about developing custom apps to use the Web Services API, you can check out:
For Developers | CA Agile Central Help
If you are looking for a Subversion connector, the information is available here:
Subversion to CA Agile Central | CA Agile Central Help
Michael