On contributing lexical data to apertium
You should be aware that the data you contribute to the project, once added, will be freely distributed under the current license (GNU General Public License or Creative Commons 2.5 attribution-sharealike-noncommercial, as indicated). Make sure the data you contribute is not affected by any kind of license which may be incompatible with the licenses used in this project. No kind of agreement or contract is created between you and the developers. If you have any doubt, or you plan to make a massive contribution, contact Mikel L. Forcada.
If you believe you are going to contribute more heavily to the project, you can join the development team through www.sourceforge.net. If you do not have a sourceforge account, please create one; then write to Mikel L. Forcada (mlf [at] ua [dot] es) or Sergio Ortiz (sortiz [at] dlsi [dot] ua [dot] es) or to Xavier Gómez Guinovart if you are interested in the Spanish-Galician language pair, explaining briefly your motivations and background to join the project. The usual way to contribute is to use CVS; as a project member, you will be able to commit your changes to dictionaries directly.