Here for the community? On May 9th, we'll be in New Orleans. Don’t miss out!
I'm checking possibility to convert CRM with Drupal.
Which is the best recommended CRM combined with Drupal?
If I understood your question correctly, you're asking what is the best CRM module for Drupal.
As far as I know, there are a few modules that provides a complete CRM experience out of the box:
Also, go through the nodes categorized with the "CRM" term as they might lead you to previous discussions and/or recipes on how to build it:https://drupal.org/taxonomy/term/36462
Other than that, you can achieve CRM-like functionality by using various general-purpose modules, such as Views, Rules, Entity, References, Profile2, Admin Views etc.
I suggest getting familiar with these modules first, then project what kind of CRM you need and compare what can you achieve with them.
Personally, I'd go with the general-purpose modules as they allow you greater range of flexibility and you still won't have to write code; but this depends on your requirements really.
Hope this helps.
Also check out the CRM group and the ERPAL project.
Drupal is a registered trademark of Dries Buytaert.