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3 Free Open‑Source Apps to Use Alongside ChatGPT in 2026

Discover three free, open‑source tools—Joplin, Greenshot, and Zotero—that complement ChatGPT, improve note‑taking, visual documentation, and research integrity for Windows users.
4 February 2026 by
TechStora Editorial Board

Joplin – A Dedicated Note‑Taking Companion

Joplin is a free, open‑source note‑taking app that excels where ChatGPT falls short: reliable, searchable storage of information. After generating prompts, outlines, or ideas in ChatGPT, copy the output into Joplin and organize it with notebooks, tags, and markdown formatting. This prevents valuable content from disappearing into the chat scroll.

  • Persistent storage of prompts and responses
  • Markdown support for rich formatting
  • Tag‑based organization for quick retrieval
  • Cross‑device sync via cloud services

Greenshot – Capture the Visual Context

While ChatGPT can summarize text, it cannot provide visual proof of how a workflow unfolded. Greenshot, a lightweight open‑source screenshot utility for Windows, lets you capture exact moments of a conversation, annotate them, and store them alongside your notes. This visual record is essential for documenting procedures, creating guides, or simply recalling a past interaction without endless scrolling.

  • One‑click screen capture (full screen, window, region)
  • Built‑in annotation tools (arrows, highlights, text)
  • Direct export to Joplin, file system, or clipboard
  • Free and actively maintained

Zotero – Strengthen Research Integrity

Zotero is a free, open‑source reference manager that turns ChatGPT’s draft ideas into rigorously sourced work. Use ChatGPT to brainstorm research questions or draft outlines, then collect PDFs, web pages, and academic papers with the Zotero Connector. The resulting library provides verifiable sources, citation generation, and a centralized repository for all evidence.

  • Collects PDFs, web pages, and metadata automatically
  • Generates citations in dozens of styles
  • Integrates with word processors for seamless bibliography creation
  • Ensures research is backed by reliable, checkable sources