Yaser Kasim, Jonathan Obika and Michael Smith are among seven players to extend their contracts at Swindon.
The trio, along with Bradley Barry and Ellis Iandolo, have seen the one-year options in their deals triggered by the club.
James Brophy and Jamie Sendles-White have also put pen to paper on new contracts at the County Ground, signing two-year deal and one-year deals respectively.
Miles Storey and Tom Smith have also been offered new contracts and negotiations are still ongoing.
However, Jeremy Balmy, Jamie Calvin, Josh Cooke, Lee Marshall, Fabien Robert and Drissa Traore have all been released following the end of their contracts.