Perfex has helped us a long way since the beginning and it is a wonderful application. Why i mentioned for freelancers and small businesses is, it can help you track and deal with all the customers. It also includes stripe payment gateway. As a freelancer, often for existing clients we need to send proposal and get their acceptance. With this, each proposal links can be generated that can be shared with the customer and the customer can sign in digitally online. The cons i feel is if you are trying to scale the organization and wants a single point to manage your HR, Book keeping, this becomes difficult.
Pipeliner CRM - Pipeliner CRM empowers small to medium-sized sales teams to close more deals and lower risk. Implementation and training are a breeze. Mac & Windows.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Zoho CRM - Omnichannel CRM for Businesses of all sizes
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.
Insightly - Insightly is the easy, powerful and affordable online Customer Relationship & Project Management Software used by over 400,000 small businesses world wide
Zendesk Support - Social Customer Support and Help Desk and Ticketing