All of the listed tools have an accessible documentation, either web-based or as a PDF, available for download. Besides UAM (O'Donnell 2008), every other application is listed as open source, so at least extensions based on code level can be made. WebAnno (Yimam et al. 2013) is the only application having a tutorial supporting a new developer to make changes in their project. ATHEN stands out in the sense that extensions to its UI can be made at runtime, therefore easing the process of adding functionality to it. WebAnno supports the largest number of formats and comes with a machine learning based automatic annotation, however lacks integrated NLP-preprocessing. CATMA (Meister 2017) is the only project that has a very good visualization component and also supports TEI-XML (Wittern et al 2009), the unspoken standard of text processing. Being a standalone web application, CATMA itself does not support NLP-preprocessing. ATHEN comes with the support of the execution of UIMA analysis engines, accessible from web repositories or a local repository, giving the user a chance to integrate her custom-made annotators. Four tools, ATHEN, UAM, MMAX2 (Müller / Strube 2006) and CATMA feature an integrated query language which helps to analyze existing corpora. Most tools allow the annotation of user-defined annotation schemas earning therefore the title “generic annotation tool”. Alongside UAM, ATHEN supports the annotation based on queries, while UAM defines its own language, ATHEN supports the annotation using Apache UIMA Ruta (Kluegl et al. 2016) rules. Three of the listed tools, MMAX2, Knowtator (Ogren 2006) and WordFreak (Morton / LaCivita 2003) are currently no longer in active development.