Value for Money
I've used Relenta for a number of years - the developers are always improving it.
Relents is an easy to use Contact Relationship Manager, Relenta is a drip email campaign manager, Relenta is an autoresponder, relenta can be a shared database.
Relenta brings a number of primary functions together into one easy to use web based application. I use Relenta for business development, holding clients hand through the process, and communication after the sale. At previous companies I also used Relenta for HR communication for on boarding and regular communication with employees.
Because Relenta allows you to create groups and multiple databases you have a lot of ways to build and manage communication channels.
Could more API connections - (Relenta uses REST not that difficult to build or is inexpensive if you need something custom.)