d4
June 9, 2026 ยท View on GitHub
d4 is a (fp-focused) collection of zero-dependency libraries you can drop into your project like header files. Each library is a simple, powerful building block for writing beautiful, type-safe dataflows.
Solve 90% problems without 900% frameworks
etl4s: whiteboard etl
ghcitty: fast, friendly GHCi
datomlite: immutable DB
eztime: time, simplified
testd: declarative data
layoutz: beautiful CLI
pipeviz: easy, elegant lineage
pin: code as doc
pg_pipeline: pipelines in Postgres