Libraries and Tools

As explained in detail in Build article, Eddie is linked or use different tools to perform tasks.
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OpenVPN -- A Secure tunneling daemon

Copyright (C) 2002-2018 OpenVPN Technologies, Inc. 
This program is free software;

you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation.

For the latest version of OpenVPN, 
go to:

	http://openvpn.net/

License: GNU General Public License (GPL v2+)
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Hummingbird - OpenVPN 3 client based on AirVPN OpenVPN 3 library.

License: GNU General Public License (GPL v3) https://airvpn.org/hummingbird/License/
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stunnel

The stunnel program is designed to work as an SSL encryption     
wrapper between remote client and local (inetd-startable) or     
remote servers. The goal is to facilitate SSL encryption and     
authentication for non-SSL-aware programs.
     
stunnel can be used to add  SSL  functionality  to  commonly     
used  inetd  daemons  like  POP-2,  POP-3  and  IMAP servers     
without any changes in the programs' code.

https://www.stunnel.org/

License: GNU General Public License (GPL v2+)
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LZO -- a real-time data compression library

https://www.oberhumer.com/opensource/lzo/ 

License: GNU General Public License (GPL v2+)
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TUNTAP -- Virtual network interfaces for Mac OS X

https://tuntaposx.sourceforge.net/

License: BSD License
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Boost 

License: Boost Software License, Version 1.0. https://www.boost.org/LICENSE_1_0.txt
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