Let's just discuss each of the features and the risk of being banned with each:
No Clip: Obviously high risk if people see you. Also, checking logs might show you being in places you shouldn't be able to access.
Wallwalk: I think this is only unsafe if you are seen using it, or go to a place you shouldn't be able to access. If you are using it to get to a place that you could access, I don't think it would be a red flag in the logs to see you in that location.
Zoomhack: I don't see how they could possibly detect this. I'm pretty sure the camera is client-side, and we know they have no client side detection. I think this function is perfectly safe.
Strafe: Not safe if you are seen using it. I don't think it would show up in the logs, however, because I believe it's just normal run speed, so it would just look like you are running straight forward. I would say it's medium risk, don't do it around people.
Nametag ESP: I don't think this can be detected at all. Should be perfectly safe.
Flyhack: Probably not safe at all. You could be seen, and it would probably show up in logs that you are not in a place you can get to by normal means.
Anti-Death: Same as no-clipping, I would assume.
CTT: I think this is an interesting one. Obviously if you are seen by someone, but many classes do have teleport utility skills. I think a lot of players wouldn't know what they saw if they saw you use it. A Thief with sword mainhand will be teleporting all over the place. Thief even has a trap that lets them teleport from a distance of 10,000. I would like to hear Buffy's thoughts on safe usage of CTT. I think doing it short distances will probably not get you noticed by players, as they would assume you are using a teleport skill. What about the server logs, though? Does anyone know if they would know whether or not you used a teleport skill before jumping forward 1200 range?
Autoloot: Pretty sure this is completely safe. All it does is spam the confirm button when it sees the Search option. Other players obviously can't see it, and to the logs it would just look like you are hitting your confirm button, which everyone does.
Speedhack: Obviously high speeds are dangerous, both from a player detection and log review standpoint. Lower speeds, though, I'm not sure about. Again, I'd like to hear from Buffy or anyone who knows more about this than I do, do you think in the logs they would be able to see if you were moving a certain speed because you had swiftness or not? If not, I don't think they could detect it through the logs. If you have astute players around you, they may notice you running faster than them without any swiftness or movement speed utilities, but they can't know if you have movement speed runes or traits, however. From a personal account, I've been using speedhack at 25% or lower for months and not been caught. Be careful when you have swiftness, though, because you will run faster than other people, and they might notice. I tend to go forward and stop and then run again, so players just think there is lag.
Field of View: I believe this is entirely safe. Same as the zoom-hack.
TP withdrawal: Obviously players can't see it. I suppose it might show up in the logs that you are not at a location where there is a TP, but there are personal TP merchants that people can spawn, so I'm not sure if they would be able to know if you had used someone's spawned TP merchant. Also a personal account: I've been using this a lot over the past few months and haven't been caught. I think it's probably safe.
Auto-explore: Most likely not safe at all. I used it on 3 characters to fully explore every zone without incident, but that was before the recent ban waves. My guess is that Anet is actively looking for people that are completing maps faster than should be possible. How they are detecting it, we don't know, but I think this is a very high risk feature.
I'd like to hear from Buffy and others what you think of my estimations. This is basically just so we can set up a best-practices procedure for things that are medium risk, and know which things to outright avoid using if you want to minimize your ban risks.