Kellogg Foundation’s Evaluation Handbook
Kellogg Foundation’s Logic Model Development Guide
Evaluation Capacity Development Group’s Toolkit for Evaluation Capacity Building in Nonprofits
Evaluation Wiki, a compendium of knowledge within the domain of evaluation
The government of the Northwest Territories has produced an excellent guidebook on writing Requests for Proposals for an evaluation, and working with evaluation consultants.
Kylie Hutchinson has released an evaluation glossary app. What a great resource to have along with you for straightforward definitions of key evaluation terms.