The placard browser explains the 9 classes of dangerous goods, and contains also a number of examples of labeling on packages and containers.
The segregation tool lets you check segregation between 2 IMO class goods and is the equivalent of the IMDG Code 37-14 Segregation Table, including the Class 1 compatibility check.
This app further contains the complete IMO Dangerous Goods database. This database can be queried with the UN number or the Proper Shipping Name (PSN), available in English, French and German. The output gives most of the relevant information an active seafarer needs to know, in order to handle dangerous cargo according to the Code.
Further we added a tool to check ISO 6346 numbers of seagoing containers, either to calculate the check-digit or to check the validity of a complete number.
The theory section contains a nice overview of the IMDG code, in different chapters, ideally for students of the code, but also useful as a reference.