CXspy
I used to run a contact center, and got frustrated with the lack of information about call center tools so I decided to build my own database. Don't trust the review sites like Gartner or G2 -- they push the products that pay them the most.
A database that lets you compare call center software by features and by customers is at Call Center Software Database For example, you can view dozens of companies by software / feature type (such as speech AI or call center AI or Call Center as a Service. Come check it out!
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