Hubspot

HubSpot combines a CRM with marketing, sales and service tools, so contact records, email campaigns, landing pages, forms and support tickets all read from the same customer database.

Its appeal is that integration: rather than stitching together separate tools and reconciling data between them, a small team gets one system where a form submission becomes a contact, enters a workflow and shows up in the sales pipeline automatically.

The CRM itself is free with generous limits, which is how most companies start. Costs rise sharply as contact counts grow and as you add the marketing and automation tiers, so it is worth modelling the price at your expected scale rather than at today's.