Portable CLU
Portable CLU is an implementation of CLU.
Other implementations of CLU.
Portable CLU is a CLU compiler intended to be easily portable. It uses C as a back-end, and then uses the local C compiler to create a binary. Portable CLU is no longer under active development, however it is by far the most recently maintained CLU compiler, and it is possible to get it to run on a reasonably modern system.
Links to several official releases can be found on the CLU homepage.
An unofficial "updated PCLU", which has been fixed to work with the latest version of GCC, can be found on GitHub. The updated PCLU will run on a modern 64-bit Linux system.