Pomodoro is released under a libertine BSD license, so feel free to use it everywhere you need. Pomodoro uses the gorgeous BGHud Framework - at least until Snow Leopard hopefully will make Hud controls public - and the ubiquitous Growl Framework for notifications. You'll have to install Growl for yourself: I could have the framework embedded in the Pomodoro installation, but the download size would have grown to 10Mb!.

Gorgeous icons thanks to Everaldo
Twitter integration thanks to the great Matt Gemmell MGTwitterEngine.
Versioning and updates thanks to the wonderful Sparkle Framework.
Global Shortcuts thanks to the Shortcutrecorder framework and PTHotKey.

The software contains sounds from the freesound project
Copyright (c) 2009, Ugo Landini (ugol@computer.org) All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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  • Neither the name of the nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.