Computing
- FatWire, an IT Vendor of CMS software
- FireWire, a high speed serial interface standard
- Firewall (computing), a security device in computer networks
- Firmware, software that is embedded in a hardware device
- Adobe Fireworks, a graphics editing program
- FrostWire, a P2P client
- an abbreviation in e-mail subjects for "Forward" (Fwd is sometimes used as well)
- an abbreviation for a Facebook application called Fish Wrangler
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