Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.
This module is a bridge to Planyo online reservation system.
PIRETS is a module for Drupal which connects to real estate listing (MLS) providers using the RETS (Real Estate Transaction Standard) protocol and impo
Integrates Drupal with Chamilo LMS by providing ways to see Chamilo resources into Drupal blocks.
Http Client is a library for making Http-requests. It has pluggable authentication methods and data formats.
This module provides a Webform component called "Newsletter e-mail" that allows to link webform nodes to one or more Simplenews newsletter subscriptions.
This module makes it possible to export Ubercart customer and order data to the Salesforce.com CRM (using the Salesforce API module).
Note that this module is no longer supported now that Drupal 6 has reached end of life, except for on a few sites where the developer installed it.
It includes support for: