100 Sights to See at the Port and 100 Encounters for a Fantasy Jungle (Black Spear) are now available on DriveThruRPG and 100 Notes, Letters or Graffiti to Find in or about Undermountain is available on DMs Guild.
Characters can have encounters at ports and 100 Sights to See at the Port has 100 such for them to see in the port or perhaps the associated settlement. They can be used as background colour or as potential adventure hooks.
Whilst travelling through a jungle, characters can have encounters and 100 Encounters for a Fantasy Jungle (Black Spear) has some that can be used for colour, or potential adventure hooks. This is a conversion of the original supplement. You do not need both versions.
100 Notes, Letters or Graffiti to Find in or about Undermountain has 100 notes, letters or graffiti to find in Undermountain, covering levels 1 to 11. Each snippet has details as to what it refers to and there are supplementary tables for customising the appearance.