The Joshua Project is one of the Frontier Ventures family of ministries and is a pretty stellar way to get familiar with people groups who have yet to hear the Good News.
Open Doors is a non-profit organization focused on serving persecuted Christians in more than 60 countries. Because, as the site says, “The number one thing that persecuted Christians ask for is prayer,” they’ve compiled some excellent resources to help you pray. They also have fantastic help for being an advocate for the persecuted church.
Operation World is the website version of the “definitive guide to global prayer” by the same name. It’s not near as comprehensive as the book, or its more user-friendly sister Pray for the World, but if you’re just beginning to pray for the world, the pared-down approach might be an asset. Includes prayer guides for all countries and regions.
Mission Data International will actually connect you with 4 web resources: Preparing to Go, ShortTermMissions.com, their quarterly publication Propel and a comprehensive Q&A called Ask a Missionary.
The UN Refugee Agency, aka The United Nations High Commissioner for Refugees (UNHCR), is a great tool to familiarize yourself with the cause of the refugee. The post Good News for the Displaced contains a link to the statistical data from this site regarding Syrian refugees.