You can find them
here but I'll go ahead and summarize them.
The first would have removed slaves from being included when considering the apportionment of Representatives and direct taxes.
The second, forth, and fifth would have increased to two-thirds of both Houses the support needed to admit new States, interdict foreign trade, or declare War (save when invaded).
The third would have limited to sixty days the amount of time a ship could be forced to remain in a port.
The sixth would have made citizens naturalized after the amendment was adopted ineligible to be a Congressman or hold a civil office under the United States, so no Sec. of State Kissenger or Albright for example.