STMicroelectronics released development board Arduino? STAR OTTO. The development board is based on STM32F469BIT6. That's the first Arduino board with complete support with MIPI? DSI display and Wi-Fi 802.11b/g/n 2.4 GHz.
Another information:
High-performance STM32F469BIT6 MCU with 2-Mbyte Flash memory, 384-Kbyte SRAM...

STMicroelectronics released wearable unit. It contains a lot of sensors. The data are sent to mobile phone through bluetooth. App is available on Apple Store? and Google Play?.
App is based on BlueST SDK, available on GitHub.

What contains this device:
STM32L151VEY6 ? 32-bit ultra-low-power MCU...

Everybody knows the Altium, program which used or design of PCB. Altium, prefessional tool is available in "lite" version. Competitor of Eagle, KiCAD and another.

Design of schematic:...

Very interesting Arduino project which was coded in very popular Visuino IDE.
Main components are Arduino Nano together with GPS reciever and microSD card. Project was designed in IDE Visuino.
Arduino Nano periodically saves GPS data from reciver and saves it to microSD card.

Tutorial there: http://www.instructables.com/id/Arduino-Nano-Log-GPS-Information-to-MicorSD-Card-W/

New single-board computer for you.
Processor: 2x 667MHz ARM Cortex-A9 (or 866MHz)
Reconfigurable Hardware: 430K gates (or 1.3M)
RAM: 512MB (or 1GB)
Flash: 16MB NOR + microSD
Wi-Fi: 2.4GHz 802.11n SISO (or 5GHz 2x2 MIMO)
Bluetooth: Classic & BLE
I/O: (see BASEBOARD SPECS for more)
Reconfigurable: 100 (or 125)
Processor: 54x GPIO
microUSB: console, 5V power
Comms: SPI, I2C, CAN, UART, JTAG, Gigabit Ethernet
Power input: 3.7V to 17V
Dimensions: 2in x 3.5in (50.8mm x 88.9mm)

You can buy another ...

The project of 8 bit spectral analyzer can be used for tentative showing, but it can be good point for improve device.
The project is based on MSP430G2553 MCU. The input is mic with LM358 opamp. The output of opamp is connected to microcontroller.
The levels are displayed on LCD 16x02 like bar graphs.

http://www.simpleavr.com/msp430-projects/8-bit-fft-spectrum-analyzer

Interesting development board from hackaday.io with ATMega32U4 and OLED display.
You can use Arduino IDE or Atmel Studio for coding.

You find schematic, PCB and example firmware on github.

https://github.com/FriedCircuits/SUPEROLED8

https://hackaday.io/project/11109-superoled8

Peoject of very smallvoltmeter with ATTiny44A and ADC MCP3421 was released on the hackaday.io.
The board of voltmeter si 20.5 x 10.5 mm and contains all of components, which you need.
In the first link find schematic, PCB and firmware for microcontrollers.
http://eklima.elektroda.eu/wordpress/wp-content/uploads/2015/11/small_voltmeter.zip

Project website: https://hackaday.io/project/8010-small-voltmeter

Maybe you somewhere found book about STM32 or general microcontrollers. This is a little different.
It includes knowledges about STM32 and makes tutorial how to begin with this very popular microcontroller.
- The introduction of book show basic features about ARM architecture
- Another part dedicates develpment tools for STM32, in this part find tutorial how to install Eclipse, compiler and debugger
- In 3th part of book find "Hello World" for STM32 and Nucleo
- 5th part shows STM32CubeMX tool
- In one of the last part find introduction of debug.

https://leanpub.com/mastering-stm32

Another rival for C.H.I.P. computer and Raspberry Pi Zero (pizero)?
Maybe, but it's still interesting project. A coin-sized ARM Linux computer with WIFI.
RobinCore, that's name of project, contains SOC Hi3518E(ARM926@440MHz), WIFI chip(MT7601U), H.264 encoder(720p@30fps) and 64MB DDR2. OpenWRT is OS for that.
You can buy another board (principle is the same like by C.H.I.P. computer) with ...

STM32CubeMX is executable in the most popular OS. MAC OS X is last OS added to list - Linux and Windows version.

http://www2.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-configurators-and-code-generators/stm32cubemx.html

LoRaONE: the LoRa? IoT development board is very popular project on kickstarter.com.
The board offers connecting your project with Internet of Things network.
The main components are SAMD21 32bit microcontroller, Ublox GPS module and LoRa? Microchip RN2483/RN2903.
Another part are RGB LED, LiPo charge controller, 3-axis accelerometer and magnetometer, LoRa? and GPS antenna connector and microUSB.

The size of board is very small - 40x25mm....

Your project - meteostation is done and do you want to make your home alarm?
Maybe this project is helpful for you. Door sensor with push notification and ESP8266 NodeMCU.
Schematic is very, very easy - it contains only ESP8266 NodeMCU...

Intel shared new development board for new microcontroller family Intel? Quark? D2000.
It contains microcontroller, 6-axis accelerometer/compass and temperature sensor and Arduino Uno rev. 3 connectors.
The development board contains programmer and debugger.
IDE is based on Eclipse and compilator is GCC.

First x86-based Intel? Quark? microcontroller, D2000, conains 32kB FLASH and 4kB OTP, 8kB SRAM, works with voltage from 2.0V to 3.3V. Clock can be up to 32 MHz....

Do you plan to use IQRF modules in your project? Check this news!
20% discount by iqrf.org

https://time4ee.com/viewpage.php?page_id=1

CubieBoard5 is out (previously CubieTruck Plus).
Short:
Octa core CPU - Allwinner H8, ARM Cortex-A7 ap to 2GHz,
PowerVR SGX544 GPU (up to 700MHz),
2GB DDR3,
SATA 2.0 connector,
HDD-RAID subboard,
USB2.0, 2x USB Host, 1x OTG,
HDD can be configured as 4 modes: RAID0, RAID1, JOBD, PM.
It contains DisplayPort and HDMI - dual display.
CubieBoard5 includes power managment for lithium battery (3.7V @ 5300mAh).
Another functions are 10/100/1000Mbps ...

BeagleBone is very popular SBC, but possibilities can be enhanced. Like in this project.
The processor of BeagleBone is AM3358 1GHz by Texas Instruments.
It contains two 46-pin expansion headers, micro HDMI, 4GByte eMMC flash, micro SD storage card, USB host/device via mini-USB OTG socket like original BeagleBone.
This version contains 1GByte of DDR3 800 RAM, gigabit Ethernet, two on-board USB2.0 type A ports and two further ports via expansion header....

arduino.org released another arduino board - Arduino M0. Arduino M0 is based on 32 bit ARM Cortex? M0, SAMD21 MCU in 48 LQFP package.
Operating Voltage: 3.3V

Input Voltage (recommended): 6-15 V

Input Voltage (limits): 4.5-20 V

Digital I/O Pins: 20, with 12 PWM and UART

Analog Input Pins: 6, 12-bit ADC channels

Analog Output Pins: 1, 10-bit DAC

DC Current per I/O Pin: 7 mA...

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We shared 3 similar SBCs (Raspberry Pi 3, Odroid-C2 and BananaPi-M2+) in this week. And we have another SBC. cnx-software shared news about NanoPi-M2,

Meet NanoPi-M2:
SoC ? Samsung S5P4418 quad core Cortex A9 processor @ 400 MHz to 1.4GHz with Mali GPU including two pixel processors, and a geometry processor.
System Memory ? 1GB 32-bit DDR3
Storage ? 1x Micro SD Slot
Connectivity ? Gigabit Ethernet RJ45 port (via RTL8211E), 802.11 b/g/n WiFi and Bluetooth LE 4.0 via AP6212 module
Video Output / Display I/F- 1x HDMI 1.4a, 0.5 mm pitch SMT FPC seat for type-A full-color LCD (RGB: 8-8-8) with 4.3? and 7? models available.
Audio Output / Input ? HDMI and 3.5mm audio jack, built-in microphone
Camera ? 24-pin DVP socket with ITU-R BT 601/656 8-bit, I2C, and I/O interface. 5MP module available....