Ask yourself this different questions :
How many leads do I have ?
How many sales guys in my team ?
What is my budget ?
How much I need to automize ?
- Streak for GMail (gratuit)
- Pipedrive (cheap and efficient)
- Hubspot (CRM gratuit mais marketing automation payant, very powerful, automatic email, très performant en cas d'inbound)
- Salesforce : Huge CRM. Go on it once you have a team of 10 sales.
- Canny io : collect and manage feedback
- Zoho : bigin to manage your press relations