Carbide.j was Nokia's IDE for Java ME. This note explains why it was discontinued.
For those who still have a previous Carbide.j licence you can download the original version which does not have support and will NOT install on Using Nokia SDKs and Tools on Windows Vista due to the age of the install kit and will NOT be fixed. This kit is only recommended for people who have previously used this product as there is no support for it. An outdated installation guide is available here, and a datasheet here. Many known problems exist for this product.