DokuWiki is a simple to use and highly versatile Open Source wiki software that doesnt require a database. It is loved by users for its clean and readable syntax. The ease of maintenance, backup and integration makes it an administrators favorite. Built in access controls and authentication connectors make DokuWiki especially useful in the enterprise context and the large number of plugins contributed by its vibrant community allow for a broad range of use cases beyond a traditional wiki.
Mayan EDMS is an electronic vault for your documents. With Mayan EDMS you will never lose another document to floods, fire, theft, sabotage, fungus or decomposition. Its advanced search and categorization capabilities will help you reduce the time to find the information you need.
Nextcloud is an open source, self-hosted file share and communication platform. Access & sync your files, contacts, calendars & communicate and collaborate across your devices. You decide what happens with your data, where it is and who can access it!
Perkeep (previously Camlistore) is a set of open source formats, protocols, and software for modeling, storing, searching, sharing and synchronizing data in the post-PC era. Data may be files or objects, tweets or 5TB videos, and you can access it via a phone, browser or FUSE filesystem.
Meemo is a personal data manager. It lets you simply input any kind of information like notes, thoughts, ideas as well as acts as a bookmarkmanager and todo list. The user interface resembles a news feed organized with tags. Full text search further allows you to quickly find information in your pile of accumulated data.