STM32F4xx official page: http://www.st.com/internet/mcu/subclass/1521.jsp
Introduction
FPU - Floating point benefits 
DSP - benefits
Price
Portfolio
Tutorial 
Application Notes, Manuals, etc 
Software Tools
Evaluation Board
STM32446E-EVAL - Evaluation board with STM32F446ZE, it includes an ST-LINK/V2 embedded debug tool, a 3.2” 240 x 320 TFT LCD with resistive touchscreen,  USB HS & FS, USART, IrDA, CAN, Digital Microphones, Audio Codec, ADC and DAC,SDRAM (4M x 16-bit) and QuadSPI Flash memories (32MB), I2C EEPROM, RF EEPROM, MicroSD card) and more.
STM32F429I-DISCO - Based on the STM32F429ZIT6, it includes an ST-LINK/V2 embedded debug tool, a 2.4" QVGA TFT LCD, an external SDRAM of 64 Mbits, a gyroscope ST MEMs, a USB OTG micro-AB connector, LEDs and pushbuttons.
STM32429I-EVAL1 - is a complete demonstration and development platform for the STMicroelectronics ARM®Cortex™-M4 core-based STM32F429 line microcontrollers. It includes a 4.3” color TFT LCD with resistive touchscreen (480 x 272 pixels), etc.
STM32439I-EVAL2 - Based on the STM32F439NIH6, it includes an ST-LINK/V2 embedded debug tool, a 5.7” color TFT LCD with capacitive touchscreen (480 x 272 pixels), an 8M x 32-bit SDRAM, 1M x 16-bit SRAM and 8M x 16-bit NOR Flash, aUSB OTG micro-AB connector, LEDs and pushbuttons.
STM32F4-Discovery
NUCLEO-F411RE - STM32 Nucleo development board for STM32F4 series - with STM32F411RE MCU, 512KB flash memory, TQFP64 package,  it includes an ST-LINK/V2 embedded debug tool. Supports Arduino 
NUCLEO-F401RE - STM32 Nucleo development board for STM32F4 series - with STM32F401RE MCU,  TQFP64 package, it includes an ST-LINK/V2 embedded debug tool. Supports Arduino 
STM & Embest STM32F4-Discovery expansion boards 
STM3240G-EVAL
STM3241G-EVAL   STM32F4 technical Overview
STM32F4 - Marketing presentation (pdf 4Mbyte)
Brochure
What is Cortex M4
STM32F4xx vs. STM32F2xx
Glossary    STM32F4 series of high-performance MCUs with DSP and FPU instructions

The ARM® Cortex®-M4-based STM32F4 series MCUs leverage ST’s NVM technology and ST’s ART Accelerator™ to reach the industry’s highest benchmark scores for Cortex-M-based microcontrollers with up to 225DMIPS 608CoreMark executing from Flash memory at up to 180 MHz operating frequency.

With dynamic power scaling, the current consumption running from Flash ranges from 100 µA/MHz on the STM32F411 up to 260 µA/MHz on the STM32F439.

The STM32F4 series consists of seven compatible product lines of digital signal controllers (DSC), a perfect symbiosis of the real-time control capabilities of an MCU and the signal processing performance of a DSP:

• STM32F401 – 84 MHz CPU/105 DMIPS, the smallest, cost-effective solution with outstanding power efficiency (Dynamic Efficiency Line)
• STM32F411 – 100 MHz CPU/125 DMIPS, outstanding power efficiency with large SRAM
  and new smart DMA optimizing power consumption for data batching (Dynamic Efficiency Line with Batch Acquisition Mode)
  
  
• STM32F446 – 180 MHz/225 DMIPS, up to 512 Kbytes of Flash with dual Quad SPI and SDRAM interfaces
  
  
• STM32F405/415 – 168 MHz CPU/210 DMIPS, up to 1 Mbyte of Flash with advanced connectivity and encryption
• STM32F407/417 – 168 MHz CPU/210 DMIPS, up to 1 Mbyte of Flash adding Ethernet MAC and camera interface
  
  
• STM32F427/437 – 180 MHz CPU/225 DMIPS, up to 2 Mbytes of dual-bank Flash with SDRAM interface,
  Chrom-ART Accelerator™, serial audio interface, more performance and lower static power consumption
  
  
• STM32F429/439 – 180 MHz CPU/225 DMIPS, up to 2 Mbytes of dual-bank Flash with SDRAM interface,
  Chrom-ART Accelerator™ and LCD-TFT controller
  
  
• STM32F469/479 – 180 MHz CPU/225 DMIPS, up to 2 Mbytes of dual-bank Flash with SDRAM and QSPIinterface, 
  Chrom-ART Accelerator™, LCD-TFT controller and MPI-DSI interface

STM32446E-EVAL - Evaluation board with STM32F446ZE

The STM32446E-EVAL helps you to discover the high-performance microcontrollers of the STM32F446 series (Cortex M4) and to develop your applications easily. It offers everything required for beginners and experienced users to get started quickly.
Evaluation board with STM32F446ZE, it includes an ST-LINK/V2 embedded debug tool, a 3.2” 240 x 320 TFT LCD with resistive touchscreen,  USB HS & FS, USART, IrDA, CAN, Digital Microphones, Audio Codec, ADC and DAC,  SDRAM (4M x 16-bit) and QuadSPI Flash memories (32MB), I2C EEPROM, RF EEPROM, MicroSD card) and more. STM32439I-EVAL2

The STM32439I-EVAL2 helps you to discover the high-performance microcontrollers of the STM32F4 series (Cortex M4) and to develop your applications easily.

• STM32F439NIH6 microcontroller
• 5.7” color TFT LCD with capacitive touchscreen (480 x 272 pixels)
• Six 5 V power supply options: Power jackST-LINK/V2 USB connector User USB HS connectorUser USB FS1 connector User USB FS2 connector Daughterboard
• SAI Audio DAC, stereo audio jack which supports headset with microphone
• Stereo digital microphone, audio terminal connector used to connect external speakers
• 2 GBytes (or more) SDIO interface MicroSD card
• RF EEPROM - M24LRxx - on I2C compatible serial interface
• RS-232 communication
• IrDA transceiver
• JTAG/SWD and ETM trace debug support, ST-LINK/V2 embedded
• IEEE-802.3-2002 compliant Ethernet connector
• Camera module
• 8M x 32-bit SDRAM, 1M x 16-bit SRAM and 8M x 16-bit NOR Flash
• Joystick with 4-directional control and selector
• Reset, Wakeup and Tamper buttons
• 4 color user LEDs
• Extension connectors & memory connectors for daughterboard or wrapping board
• USB OTG HS and FS with Micro-AB connectors
• RTC with backup battery
• CAN2.0A/B compliant connection
• Potentiometer
• Motor control connector