Because of the nature of reverse engineering, we may possibly use tools of gray or possibly illegal nature to aid our work, even if the work's intention is not for illegal use.
I recently posted an answer regarding decrypting iOS binaries, in which there is a lengthy and error prone manual process. There are many automated tools to complete this, which are widely regarded as piracy tools (e.g. Hackulous' Clutch). However, they also solve a large set of issues presented in the question and are extremely efficient (Decrypting IPAs). As such I've refrained from mentioning or linking to the relevant tools.
Is there a specific set of rules with regards to discussing and linking to possibly illegal tools?