This document discusses various neurotechnologies including EEG, tACS, PEMF, and sensory substitution. It provides links to research on using EEG-guided meditation and EEG to study working memory. It also provides information on DIY options for EEG using OpenBCI, tACS using BrainKit, and PEMF coils and waveforms. Applications discussed include using tACS to modulate working memory and tactile perception and sensory substitution technologies. Overall resources and links are presented for neurofeedback, brain stimulation, and DIY neuroscience projects.