Grist

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

Collaboration suite built to enable collaboration, synchronizing changes to documents in real time.

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.