Here is a list of 25 free, open-source applications that you may find useful:
LibreOffice - A free and open-source office suite that includes word processing, spreadsheet, and presentation software.
GIMP - A free and open-source image editor that can be used for tasks such as photo retouching, image composition, and image authoring.
Audacity - A free and open-source audio editor and recording software that can be used to edit and enhance audio files, record audio, and apply various effects.
VLC Media Player - A free and open-source multimedia player that can play a wide variety of audio and video formats.
Firefox - A free and open-source web browser that offers a fast and secure browsing experience.
Thunderbird - A free and open-source email client that includes features such as email filtering, message tagging, and support for multiple accounts.
GPG Suite - A free and open-source suite of tools for encrypting and signing email and other data.
KeePassXC - A free and open-source password manager that helps you securely store and manage your passwords.
OpenSSH - A free and open-source suite of tools for secure remote login, file transfer, and command execution.
Git - A free and open-source version control system that is widely used by developers to manage software projects.
Eclipse - A free and open-source integrated development environment (IDE) that is popular for Java development.
PyCharm - A free and open-source Python IDE that is designed specifically for Python development.
MySQL - A free and open-source database management system that is widely used in web applications.
PostgreSQL - A free and open-source object-relational database management system that is used in a wide variety of applications.
LibreCAD - A free and open-source 2D computer-aided design (CAD) application.
Blender - A free and open-source 3D computer graphics software that can be used for modeling, animation, and rendering.
Inkscape - A free and open-source vector graphics editor that can be used for creating and editing scalable graphics.
Scribus - A free and open-source desktop publishing application that can be used for creating professional-quality documents.
OpenShot - A free and open-source video editor that can be used for creating and editing video projects.
OBS Studio - A free and open-source software for recording and live streaming video.
Audacity - A free and open-source audio editor and recording software that can be used to edit and enhance audio files, record audio, and apply various effects.
OpenCV - A free and open-source computer vision library that can be used for image and video processing.
TensorFlow - A free and open-source machine learning framework that is widely used for training and deploying machine learning models.
Keras - A free and open-source deep learning library that is built on top of TensorFlow and can be used for creating and training neural networks.
Jupyter - A free and open-source interactive computing platform that can be used for data analysis and visualization, scientific computing, and machine learning.