Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...
A very quick search
using your subject as the search term gave over 400,000,000 hits:
open source tool for reports development - Google Search[
^]
A more targeted Google gave: 22,000,000:
open source crystal reports alternative - Google Search[
^]
In future, please try to do at least basic research yourself, and not waste your time or ours.