The staff at the South End Library has organized a summer swap of clean, gently used toys, books, clothes, shoes, cool stuff and anything else you no longer need but once loved and would like to pass on. That brightly striped t-shirt with "Victory Prevails" on it, or a Freddie the Pig book once loved by your great aunt, the stuffed horse you once almost strangled your brother over but now that you're both more mature needs a good home...Bring it all to the library by 6:30 PM on Tuesday and, if you have the inclination, write a few words about it and pin it to   the swappable thing. For children and teens age zero to 18. There will be goody bags for every family from Lower Roxbury Thrive in 5.