| AdE | Akademio de Esperanto | In Esperanto | → Academies |
| CDELI | Centro de Dokumentado kaj Esplorado pri la Lingvo Internacia = CDELI | Centre de Documentation et d'Étude sur la Langue Internationale | In French |
In Esperanto | → Libraries |
| CDELI | Centre de Documentation et d'Étude sur la Langue Internationale = (look above) |
In French | → Libraries |
| CEED | Comprehensive English-Esperanto Dictionary | In English | → Dictionaries |
| EdE | Enciklopedio de Esperanto | In Esperanto | → General encyclopaedias |
| FK | Fundamenta Krestomatio | In Esperanto | → Encyclopaedias, reference works |
| IEM | Internacia Esperanto-Muzeo | In Esperanto | → Museums |
| IPKK | Internacia Perfektiga Kurso de Esperanto | In Esperanto | → Education |
| ITRE | Internacia Traduk-Reto per Esperanto | In Esperanto | → Organizations and associations |
| KEV | Konciza Etimologia Vortaro | In Esperanto | → Dictionaries |
| NPIV | Nova Plena Ilustrita Vortaro | In Esperanto | → Dictionaries |
| PEK | Perfektiga Esperanto-Kurso | In Esperanto | → Education |
| PIV | Plena Ilustrita Vortaro | In Esperanto | → Dictionaries |
| PMEG | Plena Manlibro de Esperanta Gramatiko | In Esperanto | → Encyclopaedias, reference works |
| PV | Plena Vortaro | In Esperanto | → Dictionaries |
| TEC | Terminologia Esperanto-Centro | In Esperanto |