http://games.wordreference.com/language-games/verb-dash
Test your English irregular verbs
http://www.angelfire.com/on/topfen/testspastsimp1.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/irregverbs1.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/irregverbs2.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/irregverbs3.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/irregverbs4.htm
http://eolf.univ-fcomte.fr/index.php?page=verbs-irregular
http://www.miguelmllop.com/practice/irregularverbs.htm
http://www.englishforum.com/00/interactive/iverbs/
http://www.manythings.org/repeat/
Irregular verbs in a text
http://www.eslgo.com/quizzes/pastsimpleirreg.html
http://www.english-zone.com/verbs/irrpast1.html
Escribirlos todos
http://www.testyourenglish.net/english-online/vocabulary/irregular1.html
Time lines
http://www.history-timelines.org.uk/events-timelines/index.htm
http://www.history-timelines.org.uk/people-timelines/index.htm
http://www.history-timelines.org.uk/places-timelines/index.htm
How to create a timeline