These are all Snape/Lupin-centric projects written by two or more fans in collaboration.

Blessed Moon - community housing collaborations by Arionrhod and McKay.

Hate Love Letters - a Snape/Lupin project along the lines of Shoebox Project. It hasn't been updated since October, 2004.

Placet - an archive of fics and plans set in the Placet universe, an intersection of Dorothy L. Sayers's Wimsey and Parker families with the staff, students, and alumni of Hogwarts. Written by mechaieh and Catrinella.

Time of Storms - a community hosting an on-going post-HBP serial story written by Arionrhod and McKay and illustrated by Karasu Hime.

Vicious Moon - a Marauders era (set in 1979) serial story written by Innerslytherin and Thesnapelyone.