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Small interactive coding challenges

Generate and manually refine cellular image masks

A coding problem bank with topic and difficulty choices

Android scientific calculation with symbolic and graphical tools

View and control several download types together

Transfer website files with local and remote panes

Java PDF assembly, booklet layout, and metadata tools

Turn linear PDFs into booklets and back

Scan selected pages into PDF or DjVu documents

Java command-line tools for extracting and restructuring PDFs

Turn simple HTML and Markdown into PDF, EPUB, or PostScript

Compare PDF pages visually and export highlighted differences

European cultural television across several language editions

Software design as both technical and human work

A themeable game frontend for desktop and embedded systems

Graph ping responses directly in a terminal

Programming rounds and practice problems in one hub

Java and Spring tutorials organized by technology

Protocol and DNS configuration options for technical VPN users

Trim and remux media while copying existing streams

Send files using a short word-based code

Scientific and everyday calculations with units

Symbolic, numerical and graphical mathematics tools

Batch-convert DWG and DXF files between versions