Roon Core. I have found an Intel NUC with Roon's ROCK OS on it very satisfactory. I bought an 8th generation NUC with an i7 processor, 8GB of ram and a 256GB SSD on advice from an august and knowledgeable other hiker and it has been flawless. Probably more powerful than I need but it was about £480 all in so the bank was not broken.

I even managed to set it up myself successfully from Roon's instructions though I have since benefited from much help coping with Roon's bizarre and weird interface and settings.

I still prefer Sooloos for my admittedly simple needs.

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Personally, having spent a good long time now getting to know Roon, for me its only advantage is the ability to handle a wide range of endpoints. Its disadvantage, for me, is its needless optionality and complexity. For goodness sake, all I want to do is listen to music (my music, not someone else's choice).

The straightforward, nicely presented Sooloos interface which gets me where I want to be simply and easily without being overblown at all is just the ticket.
I think Meridian are mad (in US English, crazy) to give up on it and I hope they are rethinking their position.

Cinema/Music: Trinnov Altitude32 8-16,218,Cloud 4 channel, Marantz UD5007,DSP5200SE(2+C),DSP3300(4),DSW(2),271,MShort Ceilings,AppleTV 4K
TV: Marantz SR7013 Wharfedale Diamond 9x4+Celestion(C)
Music: Roon,i7NUC8gen,QNAP TS253A, Sony Scala, MS200, Garrard DDQ650,Wharfedale Diamond 12.3
Kitchen: AD88 (bluetooth via i80).