CryptPad

Highly customizable online editor providing collaborative editing in real-time.

Next-generation spreadsheet with relational structure, formula-based access control, and a portable, self-contained format (alternative to Airtable).

Office suite that enables you to manage documents, projects, team and customer relations in one place.

Server for [Gobby](https://github.com/gobby/gobby/wiki), a multi-platform collaborative text editor.

Collabora Online Development Edition (CODE) is a powerful LibreOffice-based online office that supports all major document, spreadsheet and presentation file formats, which you can integrate in your own infrastructure.

Create multimedia presentations in a quick and easy way. (documentation in French).

PHPOffice contains libraries which permits to write and read files from most office suites.