CDI is a Three Letter Acronym which in the data management world stands for Customer Data Integration.
Today CDI is usually wrapped into Master Data Management (MDM) as examined in the post CDI, PIM, MDM and Beyond. As mentioned in this post, a well-known analyst, Aaron Zornes, runs a business called the MDM Institute, which was originally called the The Customer Data Integration Institute and still has this website: http://www.tcdii.com/.
Many Master Data Management (MDM) vendors today emphasizes on being multidomain, meaning their solutions can manage customer, supplier employee and other party master data as well as product, asset, location and other core business entity types.
However, some vendors still focus on customer master data and the topic of integrating customer data by excelling in the special pain points here, not at least identity resolution and sustainable merge/purge of duplicates. One example is Uniserv Smart Customer MDM.
In my recent little venture called The Disruptive Master Data Management Solution List the aim is to cover all kinds of MDM solutions: Small or big. New (start-up) or old. Multidomain MDM, Customer Data Integration (CDI), Product Information Management (PIM) or even Digital Asset Management (DAM). As a potential buyer, you can browse all these solutions and select your choice of one-stop-shopping candidates or combine best-of-breed solution candidates that matches your requirements in your industry and geography.
First thing that must happen is that vendors register their solutions on the site here.