Lack of time is one of the typical issues founders face. Contacting investors takes time and is undoubtedly crucial. Since time is ultimately the most valuable resource, I am happy to see a tool that can help entrepreneurs save a significant amount of time.
CampaignKit - Email Validation for marketers. Detect invalid and malicious email addresses in your email lists.
Investor List - A searchable, crowdsourced list of over 1k investors
MailRefine - Decrease Email Bouncing With Best Email Verifier
Investor Hunt - Investor Hunt is the internet’s largest investor database with 40k+ angels and VCs from all over the world.
Lusha - Search less. Sell more.
OpenVC - 2200+ VC firms by thesis to find 'best fit' for your startup