Project Summary
This is another library for creating and manipulating graphs. There is simply no other graph library out there which can be handle graphs of the size the author is confronted with efficiently. Whenever possible igraph tries to be also user friendly and portable.
igraph started as an additional package to the GNU R statistical environment, and still some functions which are hard to implement in C are available only in R (like interactive graphics). Most functions are however now written in C and they can be compiled without R as a separate library.
In a Nutshell, igraph library...
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has a well established, mature codebase
maintained by a very large development team
with decreasing Y-O-Y commits -
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took an estimated 202 years of effort (COCOMO model)
starting with its first commit in January, 2005
ending with its most recent commit 6 days ago
GNU General Public License v2.0 or later
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These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
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30 Day SummaryOct 24 2025 — Nov 23 2025
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12 Month SummaryNov 23 2024 — Nov 23 2025
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