There are various agile methodologies, although ‘agile development’ is really a philosophy, not a methodology. A set of values and principles. The agile manifesto describes these values and principles, and I have also written about 10 key principles that underly most agile methodologies.
Agile methodologies are characterised as ‘agile’ when they exhibit these principles. Some examples are:
These seem to be the most widely adopted agile methodologies, however there are other agile methodologies, for instance:
Information on the web about these agile methodologies seems a little scarce, however I did find this overview of agile methodologies quite interesting.
If I’ve missed any, please feel free to add them in the comments, or let me know what you think of these methodologies…