ShareX is a comprehensive screenshot, image editing, and file sharing application for Windows. It features a modular architecture with separate libraries for screen capture, image editing, uploading, helpers, history, and tools. The application supports capturing screenshots/recordings, applying annotations and effects, uploading to over 50 services, and includes various productivity tools. Built with .NET/C# using a mix of Windows Forms and Avalonia UI frameworks, it employs MVVM patterns, plugin architectures for extensibility, and cross-cutting helper libraries. The system handles data flows from capture through editing to upload/storage, with history tracking for user convenience.
OpenScreen is a feature-rich, open-source desktop screen recording and video editing application built with Electron, React, and Pixi.js. It serves as a free alternative to Screen Studio, offering native screen capture on Windows (via Windows Graphics Capture, DirectShow, and WASAPI) and macOS (via ScreenCaptureKit and AVFoundation), with a browser-based fallback using getDisplayMedia. The application provides a complete post-production workflow including a timeline for zoom, trim, speed, annotation, and blur regions; automatic captioning using on-device Whisper (via Transformers.js); cursor overlay with smoothing, motion blur, and click bounce; webcam picture-in-picture with mask shapes; and export to MP4 (H.264 + AAC) and GIF with quality presets and a source-copy fast path. Architecturally, OpenScreen follows a multi-window Electron pattern with a main editor window, a floating HUD for recording controls, a source selector, and a countdown overlay. The renderer process communicates with the main process via a unified native bridge IPC channel, which exposes typed services for system, project, and cursor domains. Native capture is handled by platform-specific helper binaries (C++ for Windows, Swift for macOS) that stream video and cursor telemetry as JSON events. The editor uses Pixi.js for real-time compositing of video, webcam, cursor, annotations, and effects, with a spring-based physics system for smooth zoom and cursor transitions. The codebase demonstrates strong engineering practices with extensive unit and browser tests (Vitest + Playwright), internationalization across 12 locales, CI/CD pipelines for Windows, macOS, and Linux builds, and a Nix flake for reproducible development environments. However, the project is explicitly archived and no longer maintained; a community fork is recommended for continued development. The main editor component (VideoEditor.tsx) is notably large (~2000 lines), mixing state management, export logic, and UI, which presents a maintenance challenge. Despite this, many individual modules are well-isolated and reusable, particularly the export pipeline, cursor smoothing, captioning logic, and undo/redo hook.
ScreenToGif is a Windows desktop application for screen, webcam, and sketchboard recording, with a built-in editor and export to animated images (GIF, APNG, WebP, AVIF), video (MP4, AVI, MKV, MOV, WebM), image sequences (BMP, JPEG, PNG), PSD, and its own project format (STG). The architecture follows MVVM with multiple projects: ScreenToGif (WPF UI), ScreenToGif.Model (domain/enums/interfaces), ScreenToGif.ViewModel (presets/tasks), ScreenToGif.Util (helpers, codification, converters, settings), ScreenToGif.Native (P/Invoke wrappers), and ScreenToGif.Test (unit tests). The application uses .NET 9 and relies on FFmpeg, Gifski, KGySoft.Drawing, and SharpDX (for DirectX capture). It features a rich set of custom WPF controls, global keyboard/mouse hooks, undo/redo with file-based state, color quantization algorithms, and cloud upload integration (Imgur, Yandex Disk). The codebase is well-structured but shows signs of technical debt: large monolithic files, legacy encoder implementations, deprecated SharpDX dependency, and minimal test coverage.