After years of popularity with the XBee Series 1 and XBee Series 2, we now have the XBee Series 3 which brings the best of both worlds. XBee 3 not only handles 802.15.4, and ZigBee, but also BLE protocols and you can now talk to the modules over UART or SPI as well. With a 60 m indoor range, or 1200 m outdoor/line-of-sight range, you can set up a mesh network to talk to or communicate with various devices around your house, work, or other area.
This module has the familiar XBee package while sporting a PCB Antenna. You also get a built in microcontroller so you can also configure and program the modules using MicroPython as well as Digi's XCTU software. With a HCS08 CPU running at up to 50.33MHz, 15x digital I/O pins, and 4x 10-bit ADC pins these modules can even hold their own as a microcontroller.
More information in the datasheet and on the website of Sparkfun.