One of the most popular alternatives to NetLimiter is Portmaster, which is open source with a free version. Other popular alternatives are simplewall, Fort Firewall, Little Snitch and Minimal Firewall. There's no shortage of Firewalls like NetLimiter, with more than 25 alternatives for Windows, Linux, Mac, Android and iPhone.
Murus is a frontend for the OS X PF network firewall. From basic filtering to advanced proactive options, Murus allows to easily configure a complex network setup dragging and dropping icons and moving sliders and selecting checkboxes.
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TrafficToll allows you to limit download and upload bandwidth globally (per interface) and per process, even during the process' runtime.
Bouncer is an application to help you choose the correct firewall zone for wireless connections. When you connect to a new network, Bouncer will open a window prompting you for what kind of network (eg home, public, work) it is.
trickle is a portable lightweight userspace bandwidth shaper. It can run in collaborative mode (together with trickled) or in stand alone mode.
spectraNET is a free per-application network monitor for macOS, Windows and Linux. It measures every connection of every program and shows which apps use the network, how much, with whom, and whether anything looks suspicious, as an animated 2.5D city or a 2D map.
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On-device mobile bandwidth limiter for Android and iOS that applies separate download and upload caps through local VPN APIs. Use preset or custom profiles, start or stop throttling quickly, and reproduce slow-network conditions for app QA without root access or remote servers.
