OptiSurface Designer is made possible by these third party open source software.

zlib
http://zlib.net/
zlib.h -- interface of the 'zlib' general purpose compression library version 1.2.4, March 14th, 2010

Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not     claim that you wrote the original software. If you use this software     in a product, an acknowledgment in the product documentation would be     appreciated but is not required.  
2. Altered source versions must be plainly marked as such, and must not be     misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

Jean-loup Gailly  Mark Adler
mozzconf.h is distributed under the MPL 1.1/GPL 2.0/LGPL 2.1 tri-license

GDAL
http://www.gdal.org/index.html
Used for DXF import operation.

It's released under an X/MIT style Open Source license by the Open Source Geospatial Foundation

SRFR
Used for Irrigation calculations

LibCurl
https://curl.haxx.se/
Used for Mixpanel Data Analysis and OSCloud operation.

Copyright - License

Curl and libcurl are true Open Source/Free Software and meet all definitions as such. It means that you are free to modify and redistribute all contents of the curl distributed archives. You may also freely use curl and libcurl in your commercial projects.

Curl and libcurl are licensed under a MIT/X derivate license, see below.

There are other computer-related projects using the name curl as well. For details, check out our position on the curl name issue.
The curl license

COPYRIGHT AND PERMISSION NOTICE

Copyright (c) 1996 - 2017, Daniel Stenberg, daniel@haxx.se, and many contributors, see the THANKS file.

All rights reserved.

Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of a copyright holder shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization of the copyright holder.

wkhtmltopdf
http://wkhtmltopdf.org/index.html
Used for printing PDF

License
https://github.com/wkhtmltopdf/wkhtmltopdf/blob/master/LICENSE