Here's some (totally free) stuff you should definitely check out!

  • git - Distributed version control system. ↪
  • zsh - Powerful command line interpreter. ↪
  • vim - Modal, highly-configurable text editor. ↪
  • latex - Document preparation system. ↪
  • lua - Lightweight embeddable scripting language. ↪
  • minix - Reliable microkernel-based operating system. ↪

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