Slimy is a tool to find slime chunk clusters in Minecraft seeds. It can search on either the CPU or the GPU, and makes use of multithreading to speed up the CPU search.
Slimy is still in development and there are no full releases yet, however you can download the builds of the latest commit for Linux or Windows.
Alternatively, it is quite easy to install Slimy from source code: install Go, GLFW and a C compiler, then run go get github.com/vktec/slimy/cmd/slimy.
Requirements for CPU search are minimal, though performance will suffer on less powerful CPUs.
GPU search requires support for OpenGL 4.2 or greater, with the GL_ARB_compute_shader and GL_ARB_shader_storage_buffer_object extensions.
For reference, most integrated GPUs since 2013 (or 2012 on Linux) will support these features.