PDFCrowd might be a bit more popular than Clearbit Connect. We know about 1 link to it since March 2021 and only 1 link to Clearbit Connect. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If you're not into LinkedIn, you can certainly email them too. Here's a cool extension: https://connect.clearbit.com/. Basically, it'll let you find any email within a specific company (e.g., a recruiter at XYZ company). Source: almost 3 years ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: about 3 years ago
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Hunter - Find all the email addresses related to a domain
pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.