Master Yarn Chart, Handwoven Magazine

A list of all the yarns used in Handwoven magazine projects since 2000. Numbers indicate yards per pound, meters per kilogram, and a range of setts.

Ravelry

Social networking service that  functions as an organizational tool for a variety of fiber arts including knitting, crocheting, spinning, and weaving. Members share information, projects, and ideas.

Weavolution

Online, international handweaving community.

University of Arizona: Digital Archive of Documents on Weaving and Related Topics

Contains material on weaving, basketry, lace, and related subjects.

Handweaving.net

A copyright-free digital weaving archive with drafts, historic weaving documents, and more. Subscription required.