JSON Lines

On the web

dat uses JSON Lines (newline-delimited JSON) in its streaming APIs

NDJ is a similar format that also allows C++ style comments and blank lines

Bubbles supports JSON Lines datastores

Logstash supports JSON Lines via the json_lines codec

ndjson is a similar format that also allows blank lines

plot.ly uses JSON Lines for its streaming data API

Graylog GELF is format for log messages, their stream is de-facto JSON lines.

Scrapy is a framework for web scraping & crawling, it supports and recommends JSON lines since long -- it might've even coined the term.

ClickHouse is an open source column-oriented DBMS. It supports JSON lines as JSONEachRow format for input and output.