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
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.
Dataflow kit is a web scraping open source framework written in Go. JSON Lines is on of formats for storing results.
dart uses JSON Lines as one of the possible reporters when running tests.
Apache Spark uses JSONL for reading and writing JSON data.
Rumble is a JSONiq engine that runs on top of Spark. It can process datasets in the JSON lines format that have billions of objects and more.
petl is a general purpose Python package for extracting, transforming and loading tables of data. It allows importing and exporting documents/records between many databases and file formats, including JSON lines, in local and remote filesystems and clouds.