对于macOS，有Network Link Conditioner可以模拟可配置的带宽、延迟和丢包。它包含在Xcode的附加工具包中。

LANforge ICE is a network emulator with an emphasis on virtual routing, jitter, corruption and delay. Projects have used it to emulate satellite link, cable and modem connections, and high-speed (10Gbit) wan emulation. You can use a Java GUI to build your virtual networks and generate very detailed reports of the traffic flow. The LANforge products also provide traffic generation features: frame, ethernet, layer-3 and stateful traffic (NFS, http). Recent editions for LANforge have sophisticated WiFi testing features as well.

我发现这个简洁的Windows程序叫笨笨。它还处于alpha阶段，但对我来说工作得很好，而且它是开源的。

编辑:其他人已经注意到你不能用笨拙来限制带宽，这是真的。您只能添加延迟和其他一些与网络相关的错误。 这将取消这个答案作为问题的有效答案的资格，但是，由于我想要模拟一个糟糕的网络时，它很有用，所以我将把它留在这里，只要它有> 0票或类似的投票。

对于Windows，您可以使用这个应用程序:http://www.softperfect.com/products/connectionemulator/

广域网连接模拟器的Windows 2000, XP, 2003, Vista, 7和2008。

也许这是唯一一个Windows版本。

我在我的Windows电脑上使用NetBalancer。

http://seriousbit.com/netbalancer/

2017-10-07更新:NetBalancer最新免费版本为9.2.7。该程序有一个硬编码的截止日期。在启动NetBalancer服务之前，您需要在2016-10-18之前调回系统时钟。详情请参阅本文。

Take a look at the NE-ONE Network Emulator which allows you to configure bandwidth, latency, packet loss, packet reordering, packet duplication, packet fragmentation, network congestion and many more impairments so that you can create real-world network conditions in the lab. Different impairments can be configured for the up and downlink so you could have a really good uplink but a really bad downlink experience, great for seeing how the app handles TCP queuing because the acks don't come back in a timely manner and the overall latency therefore increases!

这里有一个专门针对游戏开发者的概述视频http://www.youtube.com/watch?v=DwtqlE7LcrQ，但它说明了它的内容。NE-ONE是使用web浏览器配置的，所以它真的很容易安装和配置-你不需要是一个网络专家:-)

有一个硬件版本- http://www.itrinegy.com/index.php/products/network-emulators/ne-one -或者你可以下载在VMware ESXi Server下运行的虚拟设备(软件)版本。虚拟设备可以从VMware的Solution Exchange - solutionexchange.vmware.com/store/products/ne-one-flex-network-emulator下载