Here are some websites I turn to when searching for books:
American Indians in Children’s Literature provides critical perspectives and analysis of indigenous peoples in children’s and young adult books, the school curriculum, popular culture, and society.
The Brown Bookshelf is a good blog that focuses on books with black main characters for all ages, they also feature prolific black authors.
CBC Diversity is the Diversity Committee formed by The Children’s Book Council the national nonprofit trade association for children’s trade book publishers. They are dedicated to increasing the diversity of voices and experiences contributing to children’s and young adult literature.
Diversity in YA is the premiere place to go when looking for critical analysis of the YA genre and book recs, their main focus is on POC and queer identities.
Latinas 4 Latino Lit is not just a book list of Latin@ stories, they are a literacy education resource for children focused on the Latin@ community.
Pen & Ink is a wonderful blog that posts about diverse books for all ages, they mainly focus on POC.
Queer YA (on semi-permanent hiatus, but the old reviews are good) a review of fiction of interest to lesbian, gay, bisexual, transgender, queer, and questioning teenagers.
Rich in Color is dedicated to reading, reviewing, talking about, and otherwise promoting young adult fiction starring people of color or written by people of color.
#WeNeedDiverseBooks was an online campaign pressuring publishers to go after books by diverse authors and put out books with diverse characters. This tumblr is focuses on YA and has reading lists and suggestions for diverse read-a-likes to popular titles.