Evercontact - Your contacts always up to date and automatically with Evercontact.
UXPin + Slack - Keep tabs on design projects in Slack
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
StatusOk (Open source) - Get notified through Slack/email when your website is down
Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses
Attentive - A marketing channel, built for retail & e‑commerce