Free directory
Look up any company: the decision-maker + the financials — 31 countries
The director or founder to email (then find them on LinkedIn), AND the company's real revenue to size them up before you send. The exact sources I use — with free vs paid flagged for both — across 31 countries.
Knowing who to contact gets your email to the right person instead of info@; knowing their numbers gives you the relevant hook that makes them reply. Both matter.
Most official registers give you both for free — a name you can find on LinkedIn, and accounts that tell you how big the company really is.