diff --git a/Mediapipe.Net/External/Glog.cs b/Mediapipe.Net/External/Glog.cs
new file mode 100644
index 0000000..a5da3f6
--- /dev/null
+++ b/Mediapipe.Net/External/Glog.cs
@@ -0,0 +1,105 @@
+// Copyright (c) homuler and Vignette
+// This file is part of MediaPipe.NET.
+// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.
+
+using System;
+using Mediapipe.Net.Native;
+
+namespace Mediapipe.Net.External
+{
+    public static class Glog
+    {
+        public enum Severity : int
+        {
+            Info = 0,
+            Warning = 1,
+            Error = 2,
+            Fatal = 3,
+        }
+
+        private static bool logToStderr = false;
+        public static bool LogToStderr
+        {
+            get => logToStderr;
+            set
+            {
+                UnsafeNativeMethods.glog_FLAGS_logtostderr(value);
+                logToStderr = value;
+            }
+        }
+
+        private static int stderrThreshold = 2;
+        public static int StderrThreshold
+        {
+            get => stderrThreshold;
+            set
+            {
+                UnsafeNativeMethods.glog_FLAGS_stderrthreshold(value);
+                stderrThreshold = value;
+            }
+        }
+
+        private static int minLogLevel = 0;
+        public static int MinLogLevel
+        {
+            get => minLogLevel;
+            set
+            {
+                UnsafeNativeMethods.glog_FLAGS_minloglevel(value);
+                minLogLevel = value;
+            }
+        }
+
+        private static string? logDir;
+        public static string? LogDir
+        {
+            get => logDir;
+            set
+            {
+                UnsafeNativeMethods.glog_FLAGS_log_dir(value ?? "");
+                logDir = value;
+            }
+        }
+
+        private static int v = 0;
+        public static int V
+        {
+            get => v;
+            set
+            {
+                UnsafeNativeMethods.glog_FLAGS_v(value);
+                v = value;
+            }
+        }
+
+        public static void Initialize(string name)
+            => UnsafeNativeMethods.google_InitGoogleLogging__PKc(name).Assert();
+
+        public static void Shutdown()
+            => UnsafeNativeMethods.google_ShutdownGoogleLogging().Assert();
+
+        public static void Log(Severity severity, string str)
+        {
+            switch (severity)
+            {
+                case Severity.Info:
+                    UnsafeNativeMethods.glog_LOG_INFO__PKc(str);
+                    break;
+                case Severity.Warning:
+                    UnsafeNativeMethods.glog_LOG_WARNING__PKc(str);
+                    break;
+                case Severity.Error:
+                    UnsafeNativeMethods.glog_LOG_ERROR__PKc(str);
+                    break;
+                case Severity.Fatal:
+                    UnsafeNativeMethods.glog_LOG_FATAL__PKc(str);
+                    break;
+                default:
+                    throw new ArgumentException($"Unknown Severity: {severity}");
+            }
+        }
+
+        public static void FlushLogFiles(Severity severity = Severity.Info)
+            => UnsafeNativeMethods.google_FlushLogFiles(severity);
+    }
+}
diff --git a/Mediapipe.Net/External/Protobuf.cs b/Mediapipe.Net/External/Protobuf.cs
new file mode 100644
index 0000000..6e9d1b9
--- /dev/null
+++ b/Mediapipe.Net/External/Protobuf.cs
@@ -0,0 +1,12 @@
+// Copyright (c) homuler and Vignette
+// This file is part of MediaPipe.NET.
+// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.
+
+namespace Mediapipe.Net.External
+{
+    internal static class Protobuf
+    {
+        public delegate void ProtobufLogHandler(int level, string filename, int line, string message);
+        // TODO: (from homuler) Overwrite protobuf logger to show logs in Console Window.
+    }
+}
diff --git a/Mediapipe.Net/External/SerializedProtoVector.cs b/Mediapipe.Net/External/SerializedProtoVector.cs
new file mode 100644
index 0000000..3c35ac5
--- /dev/null
+++ b/Mediapipe.Net/External/SerializedProtoVector.cs
@@ -0,0 +1,41 @@
+// Copyright (c) homuler and Vignette
+// This file is part of MediaPipe.NET.
+// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.
+
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Mediapipe.Net.Native;
+using Google.Protobuf;
+
+namespace Mediapipe.Net.External
+{
+    [StructLayout(LayoutKind.Sequential)]
+    internal struct SerializedProtoVector
+    {
+        public IntPtr Data;
+        public int Size;
+
+        // TODO: This is looking just as sus as SerializedProto.Dispose().
+        // Should be investigated in the same way.
+        public void Dispose() => UnsafeNativeMethods.mp_api_SerializedProtoArray__delete(Data);
+
+        public List<T> Deserialize<T>(MessageParser<T> parser) where T : IMessage<T>
+        {
+            var protos = new List<T>(Size);
+
+            unsafe
+            {
+                var protoPtr = (SerializedProto*)Data;
+
+                for (var i = 0; i < Size; i++)
+                {
+                    var serializedProto = Marshal.PtrToStructure<SerializedProto>((IntPtr)protoPtr++);
+                    protos.Add(serializedProto.Deserialize(parser));
+                }
+            }
+
+            return protos;
+        }
+    }
+}
diff --git a/Mediapipe.Net/External/StdString.cs b/Mediapipe.Net/External/StdString.cs
new file mode 100644
index 0000000..b5098c4
--- /dev/null
+++ b/Mediapipe.Net/External/StdString.cs
@@ -0,0 +1,29 @@
+// Copyright (c) homuler and Vignette
+// This file is part of MediaPipe.NET.
+// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.
+
+using System;
+using Mediapipe.Net.Core;
+using Mediapipe.Net.Native;
+
+namespace Mediapipe.Net.External
+{
+    public class StdString : MpResourceHandle
+    {
+        public StdString(IntPtr ptr, bool isOwner = true) : base(ptr, isOwner) { }
+
+        public StdString(byte[] bytes) : base()
+        {
+            UnsafeNativeMethods.std_string__PKc_i(bytes, bytes.Length, out var ptr).Assert();
+            Ptr = ptr;
+        }
+
+        protected override void DeleteMpPtr() => UnsafeNativeMethods.std_string__delete(Ptr);
+
+        public void Swap(StdString str)
+        {
+            UnsafeNativeMethods.std_string__swap__Rstr(MpPtr, str.MpPtr);
+            GC.KeepAlive(this);
+        }
+    }
+}