Taggathons are NEUBIAS' original concept and is an effort to bridge the life science world and the image processing world. As compared to hackathon where developers gather to code, here people gather to "tag" information in a database to create a searchable online repository for the community (the webtool). The aim is to manually annotate available implementations of image processing algorithms to offer easier access to versatile bioimage analysis components and workflows. Their mutual relationship accessible in the webtool facilitates the customization of workflows. The webtool workgroup of the NEUBIAS action organizes Taggathons to construct and to deliver the webtool: eubias.org/NEUBIAS/what-is-taggathon/