Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Keeping the house's own machines quiet: a pump, a fan, a compressor. Most of the noise travels through the structure they are bolted to rather than through the air, so the fix is at the fixing. The options here are about how the machine is mounted.