Based on the famous radare2[1]. Check out also our book[2]. And there is a list[3] of easy issues, if one wants to contribute.

[1] https://github.com/radare/radare2

[2] https://radare.gitbooks.io/radare2book/content/

[3] https://github.com/radare/radare2/labels/good%20first%20issu...