Kubaru.io - Kubaru is a fully automated lead and case assignment solution for Salesforce.

Q-assign by Ortoo - Q-assign delivers automated lead and case assignment to your Salesforce Enterprise. Now you have a whole new playbook for assigning leads in Salesforce

Distribution Engine by NC Squared - Distribution Engine is a lead routing tool for Salesforce. 

Round Robin Distributor - RRD is a powerful application on Salesforce appexchange that ensures your Leads, cases are distributed to team members in an intelligent and timely manner.

LeanData - LeanData helps companies develop account based marketing and target account seling strategies.

Gradient Works Assignment - Software to automate and optimize your team's rules of engagement processes - from lead routing to opportunity distribution to customer account assignment.