Alternativy k mailgen pro Software as a Service (SaaS) s bezplatnou licencí

• Software as a Service (SaaS)
  Všechny platformy Windows Mac Linux Chrome OS Web Self-Hosted Software as a Service (SaaS) Chrome insightly Zoho CRM Pipedrive Salesforce.com HubSpot
• Bezplatná licence
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence