If you’re looking for the equivalent Netgear managed switch to the Cisco SG series posted below, I found this Netgear GS310TP model. It offers pretty similar networking features inside a nice wide metal case (even the underlying startup-config command-format is similar to the syntax of the Cisco IOS commands).
It seems to be running pretty stable so far in home testing! The 802.1q terminology is similar to OpenWRT in terms of declaring tagged & untagged VLAN interfaces. It’s a nice, reliable unit to run!
Jon's FOSS Blog 
There actually are a couple of (L2) managed switches supported by OpenWrt as well, including PoE ones. See https://downloads.openwrt.org/snapshots/targets/realtek/generic/ for an initial set and https://biot.com/switches/models for more potentially supportable ones, rtl93xx based switches including support for 10 GBit/s are also under development.