The Stanford Large Network Dataset Collection (SNAP) library is being actively developed since 2004. SNAP researches large social and information networks. The SNAP library includes datasets from their research.

Allows you to review websites over time and draw insights from how competitor sites evolved.

A reasonably well-cataloged list of 1400+ digital marketing tools, educational resources such as podcasts and tutorials, and expertise; arranged in useful categories.

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Provides insights related to websites and mobile apps. Comparison on traffic sources, search, social, and display