Siacoins are PoW mined by GPUs. The single-threaded CPU miner featured in the Sia daemon is recommended only for testing.

• Sia-GPU-Miner by Nebulous Inc. Written in C
• gominer by @allejuppa. Written in Go

• Sia-CUDA-Miner by KlausT. Written in C
• Sia-CUDA-Miner fork by Vorksholk. Written in C
• ccminer by KlausT. Written in C

• Siamining.com - a mining pool for Sia [discussion]
• Sia.nanopool.org - a mining pool for Sia