XBL Roster Builder

XBL Roster Builder Spreadsheet. Make a copy of the file to use it (File ➜ Make a Copy):

Roster Import Tool, by Spaceman_Spumoni (this link will download a file):

Logo Import Tool, by lazy:

Zlatanimal's Roster Builder "How To" video explainer:

You should also review the Roster Creation section of the XBL Rulebook: