The Open Day of the E-Infrastructure for the Bulgarian Language and Cultural Heritage CLaDA-BG was held on the 24th October 2025 at the Administration Building of Bulgarian Academy of Sciences (BAS). At the opening of the event, Mrs. Zornitsa Georgieva, expert at the Science Directorate of the Ministry of Education and Science (MES), and Prof. Shteliyan Shterionov, Deputy Chair of BAS, delivered ceremonial speeches.

In the first half of the event scientists from the Institute of Information and Communication Technologies presented the essence of CLaDA-BG and the organization’s main activities, the usage of language resources and the application of 3D technologies. Presentations were also delivered by representatives of Institute of Mathematics and Informatics, Sofia University “St. Kliment Ohridski”, Institute of Balkan Studies and Centre of Thracology and University of Shumen “Konstantin Preslavsky”. The reports addressed topics such as language resources and technologies, as well as the collection, study, and digitization of Bulgarian linguistic and cultural heritage.

In the second half of the event, participants represented their research results in poster and demo sessions. The speakers and the guests had the chance to exchange experience and see demonstrations of various projects related to:

  • studying various aspects of speech and creating dictionaries;
  • digitalization of medieval manuscripts and sources about historical past;
  • researching buildings of historical importance to Bulgaria’s past;
  • visualizing annotated documents using large language models (LLMs);
  • digitizing the archive of Ivan Vazov National Library in Plovdiv;
  • intelligent digital management and presentation of large datasets and knowledge in the fields of culture, humanities and social sciences;
  • 3D visualisation of ancient artefacts; 
  • creating a Bulgarian corpus in an interactive online platform for children’s speech;
  • researching about verbal associations;
  • text mining for a creation of a Bulgarian event corpus;
  • organizing anthropological researches about the society’s beliefs of the recent past and debatable interpretation of the past’s different aspects;
  • updating texts to conform with contemporary Bulgarian spelling norms.    

The event was attended by more than 50 people from various organisations – universities, institutes of the Bulgarian Academy of Sciences, libraries, etc. 

Posters and presentations dedicated to resources: Language, History, Culture

Stefka Alexandrova. PoliteLab – web-based system for creating a multilingual online dictionary of speech etiquette (developed under the National Scientific Program “Development and Promotion of Bulgarian Studies Abroad”, inspired by CLaDA-BG).

Ani Angelova. PhrasoLAB-BG – web-based platform for learning Bulgarian and German phraseological units

Zhaneta Andreeva. LABMETA – web-based system for researching cognitive metaphors in Bulgarian political speeches

Zhaneta Andreeva. The web-based LABMETA system – parameters, functionalities

Tsvetan Vassilev. The Cyril and Methodius tradition in CLaDA-BG: sources, manuscripts, artifacts.

Tsvetan Vassilev and Kristian Simeonov. From scriptorium to server: digital infrastructures for cultural heritage research

Valentin Vitanov. Stories behind the facades: Zahari Alkalay’s residential building

Teodor Valchev and Nikolay Paev. Visualization of annotated documents with large language models [pdf]

Yura Konstantinova. Modern solutions for presenting cultural and historical heritage: the example of the manuscript and literary heritage of Neofit Bozveli

Dimitar Minev and Ivan Krachanov. Digital library of the National Library of Bulgaria in Plovdiv [pdf]

Ivaylo Nachev. It grows, but does not age: semantic and 3D technologies for the history of the streets and buildings in Sofia.

Petya Osenova. Language resources and technologies, large language models for processing data in Bulgarian [pdf]

Desislava Paneva-Marinova. CultIS – software platform for intelligent digital management and presentation of large arrays of data and knowledge from the humanities and social sciences. Applications. [pdf]

Nikolay Petkov. Digital vision for ancient artifacts: Research on ceramic vessels for aromatic oil from ancient Thrace

Nikolay Petkov. Three-dimensional virtual reconstruction of a late Hellenistic kerosene lamp from Voditsi, Northeastern Bulgaria

Milen Petrov. Historical Chameleons

Velka Popova, Dimitar Popov. Bulgarian corpus in the interactive platform CHILDES

Velka Popova, Dimitar Popov. Lablass – web-based system for studying word associations

Karina Simeonova. Stories Behind the Facades: Hotel Prentan

Kiril Simov, Nikolay Paev, Petya Osenova. LLM-based Models for Transforming of Diachronic Bulgarian Spelling to Contemporary Bulgarian [pdf]

Kiril Simov, Petya Osenova, Stefan Marinov, Nikolay Paev, Kristin Dimitrova, Tsvetelina Aleksandrova. Bulgarian Event Corpus: Models for Extracting Knowledge from Text [pdf]

Kiril Simov. Knowledge base, services, and large language models for knowledge extraction [pdf]

Kiril Simov. Presenting of CLaDA-BG [pdf]

Mario Filipov. Stories behind the facades: Dr. Kostov’s house

Yana Yancheva and Vladimir Kromberg. Memories from Our Childhood