- Digital library (Bulgaria)
- Digital collections (Greek National Library)
- Digital old Greek manuscripts
- Digitale library of modern Greece studies
- Digital Parliamentary library of Greece
- Digitalized old Croatian journals
- Digitalized old Croatian newspapers
- Digital library of Croatia
- Digital library of Macedonia
- Digital old manuscripts of Macedonia
- Digital National library of Moldova
- Portal „Montenegrina“
- Digital National library of Romania
- Library of the Romanian Academy of Science
- Digital National library of Serbia
- Digital library of Slovenia
- IZUM, MetaIskalnik (Slovenia)
- NALIS Foundation, National Academic Library and Information System
- NALIS Foundation. National Academic Library and Information System, Search
- Point. Digitalna knjižnica i čitaonica
- Proiect eBibliophil (Romania)
- Romanian Library Network Science & Technology
- Sofijski universitet „Sv. Kliment Ohridski“, Naučno-izsledovateski portal
- Srednovekovni slovenski rakopisi vo Makedonija
- Sveučilišna knjižnica Sveučilišta Jurja Dobrile u Puli
- Narodna biblioteka „Vuk Karadžić“ Kragujevac
- Knjižnica Instituta Ruđer Bošković
- Biblioteca Digitala a Bucureştilor
- Biblioteca digitală Transsilvanica
- Digital Library SU ‘St.Kliment Ohridski’
- Centar za socijalna istraživanja (Zentrum für Sozialforschung)
- Praxis (Journal) & further books / Memory of the World (Rudi Petrović’s Library)
- Books on capitalism, society and socialist Yugoslavia / Memory of the World (Kenneth Jungius‘ Library)
- Znaci.net: Dokumenti i knjige o drugom svetskom ratu na teritoriji Jugoslavije i povezanim zbivanjima
- Friedrich Ebert Stiftung Belgrad
- Heinrich Böll Stiftung Südosteuropa
- Rosa Luxemburg Stiftung Südosteuropa
- Konrad-Adenauer-Stiftung Serbien
- Helsinški odbor za ljudska prava u Srbiji
- Evropski pokret
- Moja Evropa
- Građanske inicijative