Btw, I've read a couple of reviews found on the 1st page of Google and can share my experience with some software there. So, my company was working with Vtiger Sales and Zoho CRM. Both software has proved to be useful, though they have a lack of analytic features. Copper, for example, leads' data storage with a complete history of interactions, and showed good results from the analytic point of view. And finally, the sales pipeline manager was a good deal tracking software that was able to track all the deals, numbers, and calls. It showed good results in data gathering and analysis in general. That's it, we haven't worked with other software https://revenuegrid.com/product/calendar-sync/ from the reviews.