MyLabBook
A Free and Open Source Electronic Lab Notebook based on WordPress
... means that thousands of additional free and open source as well as reasonably priced commercial plugins can be used to enhance its capabilities. This approach is based on over a decade's experience with the biotech program at the University of Houston and from being utilized at other universities with an NSF funded project. We continue to evolve its capabilities and ease of use.
Note that the screenshots are based on the use of some relatively inexpensive commercial plugins.