Humanyze might be a bit more popular than Planted. We know about 1 link to it since March 2021 and only 1 link to Planted. 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.
Two new ones I've recently stumbled across but haven't vetted yet: Planted.com - not sure if they're still going but emailed to ask Unicornhunt.io - european-focused startup job board. Source: over 1 year ago
This is a pretty narrow (but existing) field. You have companies like https://humanyze.com/ which deal with white collar workplaces. Then you have a ton of retail analytics companies observing both the employees and customers like https://retailnext.net/. As you get to the retail employee monitoring side you go into warehousing and factories, which I would label the blue collar people analytics space. Source: almost 3 years ago
Sequoia One - Outsourced HR designed exclusively for high tech startups.
Cadre - Cadre is a technical staffing agency and recruiting firm.
Lab 8 Ventures - Lab 8 provides project-based recruiting to companies.
Flex-Pay - Flex-Pay offers comprehensive payroll services.
SpringRole - A LinkedIn alternative on the blockchain
Extensis Group - Extensis provides human resources, risk and compliance services.