When working to complete projects on Chromebooks, more and more often I am suggesting ReadWriteThink.org.
This site is a collection of free tools that can be used for various purposes in the classroom. One of the great features about these apps is they offer the ability to save as a PDF instead of wasting paper. PDFs can easily be saved to Google Drive or Dropbox and shared with their teacher through Google Classroom, Edmodo, Moodle, Schoology or other LMS sites.
See the sampling I have outlined below.
This simple tool is great when generating, what else, Timelines! If you want something where students are more in charge of the creation, and you are on Google Apps, Google Draw can also be used to create timelines. Students and teachers really like the simplicity of this app.
Trading Card Creator- http://www.readwritethink.org/files/resources/interactives/trading_cards_2/
This is a great activity that can be used in almost any subject. This template allows students to think critically and be creative with their projects by researching details and filling in the gaps where needed. Students can create a "Baseball" card of a Fictional or Real Person or Place, Event, Object, Abstract Concept (i.e. "Love" or "Peace"), or Create their Own Template. I have used this in the past to have students create US President Baseball Cards.
Printing Press- http://www.readwritethink.org/files/resources/interactives/Printing_Press/
This great tool can be used to create a Newspaper, Brochure, or Sign(Flyer or Poster). Great tool for those without a desktop publisher.
See more Subject/Content Specific Tools here: http://www.readwritethink.org/classroom-resources/student-interactives/