AlekSIS is a web-based school information system (SIS) which can be used to manage and/or publish organisational subjects of educational institutions. Formerly two separate projects (BiscuIT and SchoolApps), developed by Teckids e.V. and a team of students at Katharineum zu Lübeck, they were merged into the AlekSIS project in 2020. AlekSIS is a platform based on Django, that provides central funstions and data structures that can be used by apps that are developed and provided seperately. The AlekSIS team also maintains a set of official apps which make AlekSIS a fully-featured software solutions for the information management needs of schools. By design, the platform can be used by schools to write their own apps for specific needs they face, also in coding classes. Students are empowered to create real-world applications that bring direct value to their environment. AlekSIS is part of the schul-frei project as a component in sustainable educational networks.