Translations of Yizkor prayers, the prayers for the deceased, into English are found at sites including Chabad.org, MyKaddish.com and OU.org. These sites also give information about the reasons for the prayer and how it is recited and honored.
The Orthodox Union gives users a lot of information about the prayers, including the different versions for mothers, fathers, male relatives and the general prayer for Jewish martyrs. There is also information about the reasons for the phrasing of the prayer, which is highly significant in terms of Jewish belief and history. The version on MyKaddish.com comes as a downloadable and printable PDF.