The digital collection Eestlased Esimeses maailmasõjas [Estonians in the First World War] is a project of the Ravhusarhiiv, the Estonian national archives in Tallinn. This crowdsourcing project aims at getting more information about the around 100,000 Estonian soldiers who served as soldiers in the Russian army during the First World War. Some 10,000 of them never returned home. The section Allikad gives an introduction to archival resources, information about the armed forces and a bibliography. Many archival records are written in Russian. You can search for the names of persons or for locations. Täpsem otsing leads you to the advanced search mode. The button Leia sõdurid kaardilt leads to an interactive map for searching soldiers and locations. The section Kasulikke viiteid contains further web links. The section KKK/Tagasiside should lead to frequently asked questions, but there is only a contact form for asking questions. The project does cover also the Second World War.The website of this project can only be viewed in Estonian.
On the blog of the Ravhuusarhiiv you can read articles about Estonia and the First World War.