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GoPDFTools

GoPDFTools is a browser-based collection of utilities for editing, converting, and optimizing PDF and image files. It includes tools for merging and splitting PDFs, compressing documents and images, converting between image formats, signing PDFs, and exporting PDF pages as images, with many tasks handled locally in the browser.

iLoveIMG

iLoveIMG is a browser-based toolkit for common image editing and conversion tasks. It supports bulk actions such as compressing, resizing, cropping, rotating, format conversion, watermarking, background removal, face blurring, and simple photo edits without requiring desktop software.

arXiv

arXiv is a long-running open archive for scholarly articles, especially preprints, across physics, mathematics, computer science, statistics, quantitative biology, quantitative finance, electrical engineering, systems science, and economics. Users can search or browse by subject area and access papers without a paywall, but arXiv itself does not peer review the material it hosts.

WordCounter

WordCounter is a browser-based writing utility for measuring text length and basic readability. Users can type or paste text to see live counts for words, characters, sentences, paragraphs, keyword frequency, reading time, and related writing statistics, with optional editing aids and account-based autosave.

DataPortals.org

DataPortals.org catalogs open data portals operated by governments, international organizations, NGOs, and other institutions around the world. The site lets visitors browse the directory, contribute additions, and download the portal list as open data.

Focus Keeper

Focus Keeper is a Pomodoro-style productivity tool for timing focused work sessions and scheduled breaks. It pairs the timer with task tracking, saved session history, and charts that help users review when and how they work best across web and mobile devices.