Our Global Nomad travels around the world as part of his work and often comes across people and sites that qualify for our criteria.
Below are a few I've found in my research and work that I admire - particularly as they offer aspects to the theme of generosity that I think are particularly helpful. (I have checked out these links in Oct/2021, and culled out those that are dead and replaced some with new links.)
GreatNonProfits.org - this site enables nonprofits to harness their most authentic and most effective advertising. There are hundreds there (I, personally, would not support all of them, but this is the most comprehensive collection I've ever found!) The stories about the various nonprofits, both Christian and secular, are submitted by those who know them well, their volunteers and donors, and keen supporters, or those who have experienced the impact and work of the organizations.
It appears to be a large site, with sub-domains to focus on specific themes, such as; to learn more about greatnonprofits go to about.greatnonprofits.org/; there is another one for the top-rated non-profits, and that list is 54 pages long! Another is specifically for Nonprofits to help them showcase their particular work, and get more donors. Plus, there is a blog that features photos and short articles about many of the nonprofits. There is much useful content to explore!
Maximum Generosity - speaker, counsellor, Brian Kluth, has much to say on giving and being a good steward of funds entrusted to you by God. (Note: your browser may want to block this site as it does not use https:// as a sign of being secure. )
10 Common Fundraising Mistakes - Mistakes to avoid for maximum effectiveness in funding your ministry. This is useful for ministries that want to make sure they promote their work wisely and legally. This is a page on the site above, kluth.org.All Nations College - this Christian school is especially focused on preparing people for missions work, and use practical methods to give experience in many original ways.
More links to come as I focus on fresh research.