Research work, presented in this article, aims to create IT tools for the study and research of handwriting, transcription and writing in general. It provides tools for structuring, processing, managing, visualizing and analyzing this data, which greatly facilitates research and study processes. An online accessible digital repertorium (web-based software environment) has been developed, storing information about valuable manuscripts and copyists with significant contributions to the development of South Slavic languages, writing and culture. Each written resource is digitized and described according to a descriptive model based on the metadata available for it. Once entered into the digital repertorium, it can be discovered through a variety of context-based search and intelligent curation services. Tools are provided for detailed study and analysis of each letter and its element, detection of similarities between pairs of manuscripts - spelling of letters and their elements, tools to support the joint simultaneous work of researchers in the system and management of the process of description and structuring of data. The goal of the development is to reach and effectively use the vast amount of knowledge about the digitized written heritage by providing tools for higher adaptability and effective interaction between the researcher and the digital repertorium.