Utilities:
- FTP: Cyberduck, Transmit, FileZilla.
- File compare: Unison, GitX, Murky.
- Windows PDF: Foxit.
- Browsers: Firefox, Chrome, and Safari.
- Mail: I mostly use Mail.app. Windows Thunderbird.
- Video Players: VideoLAN, MPlayer.
- Office: LibreOffice, Bean.
- SQL management: Sequel Pro, Navicat, pgAdmin.
- 3D: check out blender. For compositing, ramen.
- Paint: The Gimp has come a long way. Shareware: GraphicConverter.
- Audio: try Ardour or Audacity.
- Quicklaunchers: Quicksilver, Do.
- Nothing matches the elegance of HandBrake for DVD conversion.
- Video conversion trickery: ffmpeg, Mpeg Streamclip.
- KStars, Celestia, Stellarium and Google Earth let you explore the universe.
- Moving an OSX install, Carbon Copy Cloner.
- HTPC: XBMC, Sapphire, boxee, MediaPortal, MythTV, Plex.
- NAS, FreeNAS, OpenFiler, Nexenta. Alternate file systems: MacFuse.
- Disk Partitioning, GParted, visualization: GrandPerspective, WinDirStat, defrag: MyDefrag.
- Compression: UnRarX, 7zX.
- System Emulation, Virtualbox, Q/QEMU, or VMWare.
- System stats: MenuMeters.
- VNC: Windows: TightVNC.
- Some games.
Text:
- Text, GUI: Notepad++, CLI: nano, Aquamacs, MacVim.
- Unified web editors: Coda, Espresso.
- LaTeX: MacTex, Lyx.
- Screenwriting: Celtx.
- Layout/SVG: Inkscape, Scribus.
- Ebook management: calibre. CBR reader: Jomic.
- Subtitles: Jubler, Subtitle Workshop, Subler.
- RSS Agregator, NetNewsWire, Vienna.
Network:
- Port shaping, throttled, monitoring: ntop, Little Snitch, Nagios; ipfw configuration: Waterroof.
- Network testing, kismac, iStumbler, wireshark, Backtrack.
- Router Firmware: Tomato (USB builds), DD-WRT, OpenWRT, pfSense.
- DNS trickery: DynDNS, Tor.
- BT: transmission, wtorrent.
- IRC: X-Chat, ircle. Jabber: Adium.
Unix: