QuickNotify is a quick way to create Mac OS X notifications. It was created to be easy and streamlined. (And because I was bored.)
To create a new notification, simply click on the menu bar icon with the QuickNotify icon (like this: 
). You will be greeted with a dialog that has the categories Title, Subtitle, Message, Seconds, Minutes, and Hours. Title is the large title at the top of the notification, Subtitle is directly beneath it, and, finally, Message is the smallest and lowest text area.
Seconds, Minutes, and Hours denote the delay until the notification appears. To send it to the notification centre, just click send, or click cancel if you decide that you don't want to send it after all.
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
Thanks to github user petesh, whose OSxUserNotificationCenter I am using the notification center access from, as well as StackOverflow user Thomas Tempelmann, whose method for handling custom URIs in Java I used.