You can find out various open source applications and operating systems on the Internet, but if you also need a dedicated laptop for them, you may like to check the Librem 15 open source laptop.
The Librem 15 is the first high-end open source laptop where you’re in control and have complete visibility into the kernel, the operating system, and all software. The laptop measures 14 x 9.6 x 0.86 inches, weights 4.4 lbs, and comes equipped with Intel i7-4712MQ 2.3GHz quad-core processor, NVIDIA GT840M Graphics, 4GB (up to 8GB) RAM, 500GB HD (up to 1TB HD or SSD), and 15.6″ display with 1920 x 1080 pixels resolution, moreover, other specs also include CD/DVD ROM drive, three USB 3.0 ports, one HDMI port, WiFi, one pop-down R145 network port, 720p camera, SDXC card slot, HD audio, and 48Wh rechargeable battery offering up to 8 hours of usage. Apart from that, the open source laptop runs Purism GNU/Linux 64-bit operating system and the developers will continue to push upstream to free the BIOS and component firmware.
The team of the Librem 15 is raising fund via Crowd Supply. Pledging $1449 will let you own the open source laptop. If you’re interested, head to Crowd Supply official site for more details or have a look at the following demo video