+External pools with which we used to compare the poolifier results:
+
+<!-- - [node-worker-threads-pool](https://github.com/SUCHMOKUO/node-worker-threads-pool): removed because it does not support dynamic modules import or import outside the worker function. The worker function is expected to be self-contained, which makes it difficult to use in real world application without ugly hacks. -->
+
+- [worker-threads-pool](https://github.com/watson/worker-threads-pool): removed because unmaintained since more than 4 years.
+- [threadwork](https://github.com/kevlened/threadwork): removed because unmaintained since more than 3 years.
+- [microjob](https://github.com/wilk/microjob): removed because unmaintained since more than 5 years.
+- [threads.js](https://github.com/andywer/threads.js/): removed because not a threads pool.