Acknowledgements:

  1. ONESWING Viewer for Mac contains an open source product 'CocoaOniguruma'.
    CocoaOniguruma contains a part of Oniguruma 5.9.2 source code currently. See also the Oniguruma's COPYING file.
        
        The New BSD License
    
        Copyright (c) 2008-2012  Satoshi Nakagawa
        All rights reserved.
    
        Redistribution and use in source and binary forms, with or without
        modification, are permitted provided that the following conditions
        are met:
        1. Redistributions of source code must retain the above copyright
           notice, this list of conditions and the following disclaimer.
        2. Redistributions in binary form must reproduce the above copyright
           notice, this list of conditions and the following disclaimer in the
           documentation and/or other materials provided with the distribution.
    
        THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        SUCH DAMAGE.
    	
  2. OneSwingViewr for Mac contains an open source product 'Oniguruma'.
    Oniguruma LICENSE
    -----------------
    
    /*-
     * Copyright (c) 2002-2007  K.Kosako  
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
  3. ONESWING Viewer for Mac contains a part of an open source product 'Google Toolbox for Mac'.
    // 
    // GTMDefines.h
    //
    //  Copyright 2008 Google Inc.
    //
    //  Licensed under the Apache License, Version 2.0 (the "License"); you may not
    //  use this file except in compliance with the License.  You may obtain a copy
    //  of the License at
    // 
    //  http://www.apache.org/licenses/LICENSE-2.0
    // 
    //  Unless required by applicable law or agreed to in writing, software
    //  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    //  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    //  License for the specific language governing permissions and limitations under
    //  the License.
    //
    

    //
    //  GTMBase64.h
    //
    //  Copyright 2006-2008 Google Inc.
    //
    //  Licensed under the Apache License, Version 2.0 (the "License"); you may not
    //  use this file except in compliance with the License.  You may obtain a copy
    //  of the License at
    // 
    //  http://www.apache.org/licenses/LICENSE-2.0
    // 
    //  Unless required by applicable law or agreed to in writing, software
    //  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    //  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    //  License for the specific language governing permissions and limitations under
    //  the License.
    //
    

    //
    //  GTMBase64.m
    //
    //  Copyright 2006-2008 Google Inc.
    //
    //  Licensed under the Apache License, Version 2.0 (the "License"); you may not
    //  use this file except in compliance with the License.  You may obtain a copy
    //  of the License at
    // 
    //  http://www.apache.org/licenses/LICENSE-2.0
    // 
    //  Unless required by applicable law or agreed to in writing, software
    //  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    //  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    //  License for the specific language governing permissions and limitations under
    //  the License.
    //
    
  4. ONESWING Viewer for Mac contains a part of an open source product 'RSTLCopyOperation'
    //
    //  RSTLCopyOperation.h
    //
    //  Created by Doug Russell on 2/12/13.
    //  Copyright (c) 2013 Doug Russell. All rights reserved.
    //  
    //  Licensed under the Apache License, Version 2.0 (the "License");
    //  you may not use this file except in compliance with the License.
    //  You may obtain a copy of the License at
    //  
    //  http://www.apache.org/licenses/LICENSE-2.0
    //  
    //  Unless required by applicable law or agreed to in writing, software
    //  distributed under the License is distributed on an "AS IS" BASIS,
    //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    //  See the License for the specific language governing permissions and
    //  limitations under the License.
    //  
    
  5. ONESWING Viewer for Mac contains a part of an open source product 'Sparkle'
        Copyright (c) 2006-2013 Andy Matuschak.
        Copyright (c) 2009-2013 Elgato Systems GmbH.
        Copyright (c) 2011-2014 Kornel LesiƄski.
        Copyright (c) 2015-2017 Mayur Pawashe.
        Copyright (c) 2014 C.W. Betts.
        Copyright (c) 2014 Petroules Corporation.
        Copyright (c) 2014 Big Nerd Ranch.
        All rights reserved.
    
        Permission is hereby granted, free of charge, to any person obtaining a copy of
        this software and associated documentation files (the "Software"), to deal in
        the Software without restriction, including without limitation the rights to
        use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
        the Software, and to permit persons to whom the Software is furnished to do so,
        subject to the following conditions:
    
        The above copyright notice and this permission notice shall be included in all
        copies or substantial portions of the Software.
    
        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. 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.
    
        =================
        EXTERNAL LICENSES
        =================
    
        bspatch.c and bsdiff.c, from bsdiff 4.3 :
            Copyright (c) 2003-2005 Colin Percival.
    
        sais.c and sais.c, from sais-lite (2010/08/07) :
            Copyright (c) 2008-2010 Yuta Mori.
    
        SUDSAVerifier.m:
            Copyright (c) 2011 Mark Hamlin.
    
        All rights reserved.
    
        Redistribution and use in source and binary forms, with or without
        modification, are permitted providing that the following conditions
        are met:
        1. Redistributions of source code must retain the above copyright
           notice, this list of conditions and the following disclaimer.
        2. Redistributions in binary form must reproduce the above copyright
           notice, this list of conditions and the following disclaimer in the
           documentation and/or other materials provided with the distribution.
    
        THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
        DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
        IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        POSSIBILITY OF SUCH DAMAGE.