I am studying graph algorithms.
I need database of graphs on which I can test my algorithms.
Where can I find reliable database of graphs of all kinds?
MathOverflow is a question and answer site for professional mathematicians. It only takes a minute to sign up.Sign up to join this community
There's a nice collection of data on regular graphs at Markus Meringer's webpage.
Sage (http://www.sagemath.org/) provides access to a large collection of graphs, as well as tools for working with them.
Discrete ZOO should also be mentioned here. As of 2 March 2018, it reports to host 212238 graphs.
nauty comes with some additional programs. In particular, you might be interested in geng. As the website says "geng can generate non-isomorphic graphs very quickly. There are also generators for bipartite graphs, digraphs, and multigraphs."
Maple 13 or newer has a GraphTheory package that has a graph generator which allows you to generate all non-isomorphic graphs satisfying various criteria. You can use that to produce graphs and export them in various formats. In addition, you can produce random graphs using this package.
Here's a collection of 3054 "standard named graphs" from Mathematica's GraphData collection http://yaroslavvb.com/upload/graphs2.txt
It's one graph per line, description followed by pairs of adjacent vertices