Hardware & software:
- Homebrew at http://brew.sh for free from Leo Laporte.
- Nix at https://nixos.org/nix/ for free from Leo Laporte.
- Probrother Soshine Mini USB Power 6 LED White Light Lamp 1W 5V Dimmer White Light(5 Pcs) Compatible With USB Device Laptop Power Charger for $9.99 (Amazon Affiliate Link) from Andy Ihnatko.
- SoundShare – Mateus Abras (for iPhone) for free from Rene Ritchie.