Other
Web ref.org: Niobium
Basic information on niobium, along with a summary of some of its major uses.
Royal Society of Chemistry
Royal Society of Chemistry: Niobium
Basic information on the origin of the name and the uses of niobium
TED Talks
Ted: Ted Ed: Niobium: Periodic Table of Videos
The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about niobium, a particularly friendly element. [9:27]
Other
Reade International Corp.: Niobium (Nb) Powder, Shot, Pellets & Ingot
Good summary of information on niobium and its properties.
Florida-Spectrum Environmental Services
Florida Spectrum: Chemical Fact Sheet: Niobium
A thorough summary of the properties and uses of this metal.