Pipedrive
Used by 5 peoplepipedrive.com ↗

“Every week I spend hours, usually starting Sunday night to manage the scaries, but then every single workday, using a customer relationship management tool called Pipedrive that lets our firm track client relationships and potential relationships.”
Paul Ford Interview, Developer, writer, CEO (Postlight) · via Uses This 
“GitHub manages all our code and bug tracking, and we use Pipedrive for dealing with customers.”
Evan Prodromou Interview, Developer, founder (fuzzy.io, Wikitravel, Identi.ca) · via Uses This