This is an excellent site in that it has lesson plans, a short educational documentary on gratitude, printable gratitude coupons and more. A most valuable part is that it breaks down, by age level, child development as it pertains to character development
A blog post from the blog "The Mindful Classroom" on kindness. Includes a bulleted list of mentor texts to be used in the classroom-many of these are in most well stocked school libraries but may be overlooked. All, of course, are on Amazon and are great additions to teacher wishlists for parents to purchase.
An excellent article that applies to all workplaces. The article identifies three "culture types" in the workplace. It is helpful for teachers and leaders to understand these types so that they can contribute to building a culture of kindness.
A link to resources that go along with the excellent book by Tom Rath "How Full is Your Bucket". The book talks about filling other's invisible buckets and not being a bucket "dipper". Powerful tool and resources for whole school or individual classrooms!