In no particular order:
Server: Windows server in the loft running Logitech Media Server and 17k tracks by 2.2k of artists, rips from my CD collection, a few bought hi-res files, etc. CDs now archived in Library.
Kitchen:
Logitech Squeezebox Touch, MiniDSP 2x4HD into LS3/5a sized boxes with Monacor units, and B&O Ice Power class D amps, active DSP x-over
Bedroom:
Logitech Squeezebox Touch, Muse class D amp, Mission / Denon speakers.
Office:
Logitech Squeezebox Touch, DIY shunt passive preamp, using ALPS blue, Meridian M3 Active speakers.
Barn:
Vinyl system:
Transcriptors Skeleton, with Gyrodec AC motor, powered from Meldano TTPSU. Vestigial arm, Decca London Gold, Naim MM/MC head amp (DIY) with Naim Supercap regulator modules, powered from DIY Hi-Cap, Radford SC22 preamp with DIY PSU.
This then links into the TV system:
Sony TV, Fire TV, Chromecast, Cyrus AV5 multichannel preamp.
Centre speaker - Fostex 'full range' open baffle powered by class D chip amp.
Front speakers - Quad ESL57, powered by DIY Gainclone monoblocks
Rear Speakers - Meridian M30 actives
Sub - Linn Sizmik without the Linn amp, powered by a Sub-Zero PAD400 class D studio amp, with Behringer DEQ2496 for DSP, and Behringer DCX2496 as crossover.
This runs as surround for TV, and in Stereo (Quads and Sub only) for LPs.
Lounge:
Raspberry Pi running Volumio with Squeezelite plugin, USB to Lakewest/Audiolab MDAC, Radford STA25, Martin Logan Summit.
Radio Paradise, Tidal and tracks from our server. Multiroom with LMS / SBTs around the house.
Library:
Denon D M30 mini system, Chromecast Audio, JPW / Denon SC M2 speakers.