De Boer played 138 games for the Dockers, while Pearce played 100 matches and Mzungu made 102 appearances for the club.
Hannath played 20 senior games.
“Matt and Clancee came to the club via the 2008 Rookie Draft and Tendai in 2010 as a mature age recruit, with all three going on to forge 100-game careers at Fremantle,” General manager of football operations Chris Bond said.
“The fact that Matt, Tendai and Clancee were able to achieve such important career milestones is testament to their resilience, work ethic and commitment to the club.
“Matt and Tendai will also always have the honour of being part of the club’s first grand final team in 2013.
“Jack is a fine young man who had a positive impact on the group and has worked really hard to establish himself as an AFL player in his four seasons at the club.
“We value what Matt, Tendai, Clancee and Jack have each done for the club and thank them for their commitment and professionalism throughout their time at Fremantle.
“We wish them all the best for the future.”