Good tools to manage big contact lists?

Looking for something like agile crm that would allow me to add contacts to a database, and ignore any duplicates.

I want to be able to add columns / fields also.

Using excel now but my list is growing and getting hard to manage. Honestly a visual excel tool would be pretty sweet.

submitted by /u/nosebevies
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source https://www.reddit.com/r/Emailmarketing/comments/lajmt2/good_tools_to_manage_big_contact_lists/