This simple application is a showcase of the unsecure terms under which people handle their private data. As you will notice you can sometimes access someone's entire harddrive directly over the internet. This is most often not intended.
The latest version is 1.0b3, download it here.
Note that you'll need Mac OS X 10.5+ to run Delve.
Source code is available at GitHub.
Now you need to login with your system username and password to get access to the shared folder, instead of it being open to anyone. Repeat the above steps for all folders you are sharing.
Delve is licensed under GPLv3.