17 September 2025
Christoph Neumann
Welcome to the Clojure Deref! This is a weekly link/news roundup for the Clojure ecosystem (feed: RSS).
Clojure real-world-data 35: Sep 19
Clojure South 2025: Oct 6-7
Macroexpand 2025: Oct 17-18, 24-25
Clojure/Conj 2025: Nov 12-14
Complex multimethod processing, in Clojure - Clojure Diary
Middleware vs interceptors in Clojure web applications - Andrey Fadeev
Debugging a debugger - Juan Monetta
Clojure Java interop practical guide - Andrey Fadeev
My experience with Cursor and Clojure-MCP - Julien Bille
Bayesian Optimization in Machine Learning | Flexiana - Jiri Knesl
New releases and tools this week:
joyride 0.0.63 - Making VS Code Hackable like Emacs since 2022
integrant 1.0.0 - Micro-framework for data-driven architecture
calva-backseat-driver 0.0.20 - VS Code AI Agent Interactive Programming. Tools for CoPIlot and other assistants. Can also be used as an MCP server.
partial-cps - A lean and efficient continuation passing style transform, includes async-await support.
kindly 4-beta20 - A small library for defining how different kinds of things should be rendered
scittle 0.7.28 - Execute Clojure(Script) directly from browser script tags via SCI
pod-babashka-go-sqlite3 0.3.9 - A babashka pod for interacting with sqlite3.
clay 2-beta56 - A REPL-friendly Clojure tool for notebooks and datavis
ring-defaults 0.7.0 - A library to provide sensible Ring middleware defaults
pg-bin - Parse binary Postgres COPY output
clj-otel 0.2.9 - An idiomatic Clojure API for adding telemetry to your libraries and applications using OpenTelemetry.
aleph 0.9.3 - Asynchronous streaming communication for Clojure - web server, web client, and raw TCP/UDP
color-tools - A complete toolkit for working with colors in Clojure and Clojurescript applications
clojure-mcp 0.1.9-alpha - Clojure MCP
qclojure 0.18.0 - A functional quantum computer programming library for Clojure with backend protocols, simulation backends and visualizations.
lazytest 1.9.1 - A standalone BDD test framework for Clojure
calva 2.0.527 - Clojure & ClojureScript Interactive Programming for VS Code