Share is a Japanese P2P client which is very obscure and very illegal. Here's a mirror for the current TCP client.
Share10_ex2.zip ファイル倉庫NT56s0tGbv 753,309 e3ebc4e73fb2ce8ed5e3904a82067715be0dd4fd
Some good node lists:
To figure out share, see http://uguu.org/share/. It is most informative.
Some people have trouble with Share because they can't forward ports. Most routers do however support UPnP (Universal Plug-and-Play). Here is an HTTP mirror for the UPnP plugin for Share.
[PDK10] UPnP_0.0.zip MD5
[Share Plugin] [PDK10] UPnP_0.0.zip 608,216 78a9619ce7a543192d6233104c2a15adbbc3e5dc