Dangerzone is a free and open source project maintained by Freedom of the Press Foundation. It converts potentially dangerous PDFs, office documents, or images to a safe PDF. Documents are sanitized in a sandbox with no network access, and the document is converted into pixels and rebuilt as a PDF.
wkhtmltopdf and wkhtmltoimage are open source command line tools that render HTML into PDF and image formats using the Qt WebKit rendering engine. They run headless without a display or display service. A C library, libwkhtmltox, offers bindings for PDF and image conversion.
PDFEncrypt is a free, open-source native Windows app that encrypts PDF files using standard PDF encryption algorithms. Users specify a password required to open the document along with options and permissions for the PDF. Encryption runs locally on the Windows PC rather than uploading files to a third-party server. The app uses the iTextPDF library and is released under the AGPL license.
PDF4QT is an open source PDF editor for Windows and Linux under the LGPLv3 license. It offers applications for viewing, editing and rendering PDF documents, plus a C++ library and command line tool for developers. Features include digital signature verification, annotation editing and page organization such as merging and splitting.
VERNAM is a free, open-source file encryption tool that runs entirely in the browser. It encrypts any file with a passphrase using XChaCha20-Poly1305 and Argon2id, and no files or passwords are uploaded. It is published by PrivacyTools.io and offers an optional high security mode with heavier key derivation.
FreeFileSync is a free open source data backup application for comparing and synchronizing files and folders on Windows, macOS and Linux. It determines differences between a source and target folder and transfers only the minimum data needed rather than copying every file. The website also references a separate Business Edition available for license extension.
Rectangle is a macOS app that moves and resizes windows using keyboard shortcuts or snap areas. It is free and open source, supports macOS 10.15 and later on Intel and Apple Silicon, and can act as a drop-in replacement for Spectacle. A paid Rectangle Pro version adds custom shortcuts for any size and position.
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wkhtmltopdf and wkhtmltoimage are open source command line tools that render HTML into PDF and image formats using the Qt WebKit rendering engine. They run headless without a display or display service. A C library, libwkhtmltox, offers bindings for PDF and image conversion.
PDFEncrypt is a free, open-source native Windows app that encrypts PDF files using standard PDF encryption algorithms. Users specify a password required to open the document along with options and permissions for the PDF. Encryption runs locally on the Windows PC rather than uploading files to a third-party server. The app uses the iTextPDF library and is released under the AGPL license.
PDF4QT is an open source PDF editor for Windows and Linux under the LGPLv3 license. It offers applications for viewing, editing and rendering PDF documents, plus a C++ library and command line tool for developers. Features include digital signature verification, annotation editing and page organization such as merging and splitting.
VERNAM is a free, open-source file encryption tool that runs entirely in the browser. It encrypts any file with a passphrase using XChaCha20-Poly1305 and Argon2id, and no files or passwords are uploaded. It is published by PrivacyTools.io and offers an optional high security mode with heavier key derivation.
FreeFileSync is a free open source data backup application for comparing and synchronizing files and folders on Windows, macOS and Linux. It determines differences between a source and target folder and transfers only the minimum data needed rather than copying every file. The website also references a separate Business Edition available for license extension.
Rectangle is a macOS app that moves and resizes windows using keyboard shortcuts or snap areas. It is free and open source, supports macOS 10.15 and later on Intel and Apple Silicon, and can act as a drop-in replacement for Spectacle. A paid Rectangle Pro version adds custom shortcuts for any size and position.
