WEBSITES ON RAISING THIRD CULTURE KIDS:
MK Planet is the most comprehensive MK website I've found. It contains a blog, forums, a Facebook group, a book club on Goodreads.com to encourage MKs to connect with other MKs. There is a resource center with lists of clubs and organizations, support, scholarships, blogs, magazines, books, etc. They also have a store with books helpful to MKs for purchase and a calendar with conferences geared toward MKs listed.
SIL's MissionHR website has excellent articles about issues facing TCKs and their families; lists of books for TCKs; and links to online resources for TCKs. They also have information on educational options, curriculum options, and international schools around the world.
The International Society of Missionary Kids is a ministry of Assemblies of God churches and is designed to meet the needs of MKs within their organization. Though much of the information is specific to AG MKs (scholarships, mission trips), the site does contain a helpful education resource and some other resources.
MK2MK is a division of Campus Crusade for Christ to support MKs. Their website has links to books, websites, blogs, videos, podcasts, and downloads relevant to MKs and their parents in the resources section.
Interaction International publishes Among Worlds Magazine, a magazine for TCKs and their parents, and Interact Magazine, which addresses issues in TCK education and care. Their website has suggestions of books and articles about TCK issues as well as a book list for internationally mobile adduces and a directory of international therapists familiar with the TCK experience. Additionally, they run seminars on transitioning to college, educational planning, issues related to MK care, re-entry for adults, and training those within the church who care for overseas missionaries.
TCK World contains the research of Dr. Ruth Useem who coined the term Third Culture Kids. Also included on the website are teleclasses and articles, some of which require only an email address to access, others requiring a membership.
Cross Cultural Kids is the blog of Ruth Van Renken, co-author of Third Culture Kids: Growing up Among Worlds. It contains information about TCKs, resources for them, and Van Renken's work.
This website contains the articles and videos of Michele Phoenix, who grew up as an MK and then spent 20 years teaching TCKs. Her blog shows tremendous insight into issues and attitudes that MKs face. She has also created the MK Harbor Project, connecting young adult MKs who are transitioning back to the US with people around the country who want to support their transition.
TCK Training offers workshops, seminars, parent coaching, and consulting services for organisations as well as a blog on TCK related issues and lists of resources for TCKs and their parents.
Euro TCK is a UK-based organisation which puts on an annual TCK conference in Europe for TCK caregivers and adult TCKs. Their website also has some resources and links to issues of the Educare newsletter, containing articles on TCK issues.
Equipping Minds is not geared to missionaries, but they have a heart for missionaries and are very flexible on price for them. The organization has a curriculum to help people strengthen their "working memory, visual and auditory processing, attention, processing speed, logic, comprehension, and more... The program is designed to help any individual wanting to strengthen their ability to learn. This includes the typical developing student, gifted & talented, elderly (seniors), LD, SLD, ADHD, TBI, Down Syndrome and many more." In addition to the curriculum that is available on their website, they work with families all over the world by Skype.