Some suggestions
DeBonos thinking hats
https://www.debonogroup.com/services/core-programs/six-thinking-hats/
@danashby’s workshop
Big list of naughty strings of course, thank you @stephennb for sharing
Ministry of Testing is working on a new version of this with Elisabeth, watch this space!
TestSphere from @berenvd
Would Heu-Risk It from @pejgan
@alex_schl’s Microheuristics popped up, find more about that here Ask Me Anything: Managing Risk - Further Discussion - #2 by heather_reid
@conorfi’s blog
https://conorfi.com/software-testing/software_testing_heuristics/