PDF4Teachers is a free and open-source PDF editor, that aim to optimize the correction of PDF assessments.
The app is based on recording of all annotations, which allow quick insertion of recurrent advices and corrections : each annotation added is saved in a list where one can pick previous annotations. The annotations can be written in LaTeX or LibreOffice Math.
The app offers functionalities of grading, which allows to assess student's scripts faster (shows automatically the next grade to pick, automatic sum, export grades in a spreadsheet...).
It is also possible to use the scoring by skill feature (assessment creation, adding of specific skills to assess, and then grading of each student, with a table automatically generated).
The freeform drawing, adding of images or vector icons is also possible in the application.
PDF4Teachers also offers you a lot of useful additional features, like the conversion of a batch of images in several PDF files, or rotation,pages shifting, page deletion. Read more details with the documentation.
PDF4Teachers is not a business company. The app and the website are developed by a high school student, Clément Grennerat.
The code of the application is distributed under the license Apache 2.0 so you can edit it and reuse it in your projects, in agreement with the license conditions. You can use PDF4Teachers for a commercial use, and you can distribute the app. All legal information are available on the license page.
You can find more information about dependencies and technologies used on the GitHub repository of the projet.
You can support the project with a donation. Either with a monthly donation with GitHub Sponsors, or a single donation on PayPal.