Of PC/Mac networking I know nowt, and even less about software to enable networking with current OSs for PC. There may or may not be current programs of the like of DAVE in existence.
But old Macs in a LAN? No doubt. But for poking in a DB-9/MiniDIN-8 cable and switching on, I am at the point of dragging even my 512Ke/System 6.0.8 into my LAN. True, it needs LocalTalk/Ethernet (LT/EN) and SCSI/Ethernet (EN/SC) adapters and 10Base-T hubs to drag some of them in, but it's happening, from iMac CRT/OS 10.4 down to Classic II/System 7.5, even as we speak ...
Tiger needs that older Macs call it over TCP/IP, and it won't call them back, but a one-way connection is all that is needed. For older Macs again with only AppleTalk, it's a two-hop process from super-oldie to oldie to Tiger. Miles faster, and still more reliable than FDD/floppy as intermediary.
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