Astronomy Picture of the Day features a different space image or video each day, with an explanation by an astronomer and an archive of past entries.
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SDelete is a command-line Sysinternals utility that securely overwrites existing files and cleanses free space on a logical disk, including data in unallocated portions. It accepts wildcard characters in file or directory specifiers and implements the Department of Defense clearing and sanitizing standard DOD 5220.22-M. The tool securely deletes file data but not file names located in free disk space.
late.sh is a command-line community space for computer enthusiasts, accessed through any SSH client. It offers chat, radio stations, arcade games, a collaborative ASCII artboard, daily challenges and tech news discussion. Identity is based on SSH public key fingerprints, with an optional companion CLI for audio, a visualizer and image pasting.