Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.

Sequoia One - Outsourced HR designed exclusively for high tech startups.

CB Insights - CB Insights is a company database for the venture capital and corporate development community.

Planted - Planted is a mobile and online recruitment platform that matches recent graduates with non-technical roles at high-growth companies.

Tracxn - data on companies

Cadre - Cadre is a technical staffing agency and recruiting firm.