VERT is a file conversion utility that uses WebAssembly to convert files on your device instead of a cloud. All image, audio, and document processing is done on your device. Videos are converted on our lightning-fast servers. No file size limit, no ads, and completely open source. (AGPL)
Cross-platform
Freeter is a free and open source organizer for those who work on the computer. Gather everything you need for work in one place, organized by projects and workflows, and have a quick access to them. Easily switch between projects and workflows, and stay focused on current things you need to do. (GPL)
Linux - Windows - macOS
Xecrets File Command Line is a powerful cryptographic toolbox available for Windows, macOS and Linux. File encryption is compatible with AxCrypt, in fact it is based on the exact same code, but does not have a graphical user interface as it's been re-engineered into a pure command line utility. (GPL)
Windows - macOS - Linux
Gammath SPOT (Stock Price-Opining Toolset) is a free and open source software for comprehensive technical analysis of stocks. It has tools to do the following: Obtain analysis-data from the Internet, Compute easy-to-understand analysis scores, Compute price estimates and projections, Generate analysis history and Backtest trading strategy. (GPL)
Cross-platform
EFCK (Emoji Filter Chat Keyboard) is a free cross-platform open-source on-screen desktop emoji keyboard, with a built-in text-filter emoji picker, a Unicode text converter and meme (GIF) search functionality. (AGPL)
Cross-platform
Abc-Map is a free and open source mapping software. With Abc-Map you can easily create, edit and visualize geospatial information. You can export maps to PDF or share them online and even embed them in your websites. Abc-Map works on all platforms with a web browser (Linux, Mac OSX, Android, IOS, Windows). (GPL)
Cross-platform
Reactive Resume is a free and open source resume builder that’s built to make the mundane tasks of creating, updating and sharing your resume as easy as 1, 2, 3. With this app, you can create multiple resumes, share them with recruiters through a unique link and print as PDF, all for free, no advertisements, without losing the integrity and privacy of your data. (MIT)
Cross-platform
Syncthing is a continuous file synchronization program. It synchronizes files between two or more computers in real time, safely protected from prying eyes. Your data is your data alone and you deserve to choose where it is stored, whether it is shared with some third party, and how it's transmitted over the internet. (MPL)
Linux - Windows - macOS - FreeBSD
Subtitld is probably the best open source software to edit, transcribe and create subtitles. It is able to read SRT, SSA, TTML, SBV, DFXP, VTT, XML, SCC and SAMI file formats and to write SRT file format by default. (GPL)
Linux - Windows
Dotgrid is a grid-based vector drawing software designed to create logos, icons and type. It supports layers, the full SVG specs and additional effects such as mirroring and radial drawing. Dotgrid exports to both PNG and SVG files. (MIT)
Linux - Windows - macOS