MailStore - MailStore Home - A 100% free single-private-user desktop solution
Dynamic Campaigns by Sigstr - Share the most relevant content in every email
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
PushMarket - Automate personalized emails for ecommerce (YC15)
MailMeter - MailMeter is a software that allows cloud or on-premise-based email management and compliance platforms, helping you to locate every single email in your organization, conduct eDiscovery, freedom of information, and DSAR’s searches from your emulato…
InboxSDK - First usable API to write Gmail Apps for 1B active users