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RSS3-Protocol
Discontinued RSS3 is a next-generation feed standard that aims to support efficient and decentralized information distribution.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not exactly a search tool, but this project crawls and aggregates web3 data from multi-chains pretty effectively. You can try out its data tool unidata. https://unidata.app/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.