AngelList: Provides information about startups, including funding rounds, investors, and valuation.
PitchBook (Limited Access): PitchBook offers limited free access to funding data, including company financials. You can use it for quick research without spending credits.
Public Filings (SEC EDGAR): For U.S. public companies, the SEC’s EDGAR database is an excellent source of detailed funding and financial information.
CB Insights: CB Insights has a free newsletter and some free reports that often include funding data, especially on trends and specific companies.
Seedrs & Crowdcube: If your interest is in startups seeking crowdfunding, these platforms often provide detailed funding info without needing to pay.