Neat! If you find this interesting, Thanissaro Bhikku of Metta Forest Monetary has absolutely superb resources with guided meditations, talks, and e-books, all for free under creative commons[1]. This is in the Thai Forest lineage, so not purely secular, but I feel like there's so much being offered to learn from in a full teaching tradition that it would be a loss to just focus on a Jon Kabat-Zinn style mindfulness meditation technique.