php-gif
Below GIF image is an example image which can contain real-time data. A PHP script calculates the pending time till new year and generates the GIF image. An ideal solution for sending e-mails with real-time data to customers. E-mail clients give you the opportunity to load images by URL and so everytime the client re-opens the e-mail message, the GIF will be re-generated with real-time data.
For below image this doesn't work, unfortunately, cause github downloads the image and stores it. E-mail clients, however, do load the images directly from source :)
The MIT License (MIT)
Copyright (c) 2015 Erik van de Ven
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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 OR COPYRIGHT HOLDERS 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.