Cross-classable:
[CRP-50] Byregrot's Blessing: Doubles the effect of Inner Quiet Stacks for one synth. Resets them after use.
[BSM-50] Ingenuity 2: 32 CP, lowers the recipie's effect on both Progress and Quality advancement significantly for five steps. Often doubling it for 3 and 4 star recipies.
[ARM-50] Piece by Piece: 15 CP, 90% Success, hits for 1/3rd of remaining Progress. Ex: Craft with 400 Progress, 1st would hit for ~132, second would hit for ~88.
Mostly used for 3 and 4 star crafting, because of the high amount of progress that must be chewed through.
[ARM-15] Rapid Synth: 0 CP, 50% Success, 250% Efficiency Progress Raise.
Also mostly used in 3-4-star to reduce the number of Progress steps to raise the number of Quality steps available.
[GSM-15] Manipulation: 88 CP, returns 30 durability over the next three steps. Craft WILL fail if it hits 0 durability while this is up. 2nd most efficient Durability restoration. Most efficient for 40-dur crafts.
[GSM-50] Innovation: 18 CP, Increases control by 50% for 3 steps. Nice, but not game-changing. Can be used to bait for a good/excellent for the byregrot's, but for 3&4 stars, you may not have enough cross-class slots to have it.
[LTW-15] Waste Not: 56 CP, Makes Progress and Quality steps take 5 durability instead of 10 for the next 4 steps.
[LTW-50] Waste Not 2: 98 CP, Same as 1, but for 8 steps. Both can spare a step and still have basically full effect. As finishing with progress 5 dur is no different from finishing with 10 dur.
[WVR-15] Careful Synth: 0 CP, 100% Success, 90% Efficiency Progress Raise.
[WVR-50] Careful Synth 2: 0 CP, 100% Success, 120% Efficiency Progress Raise. Excellent, excellent skill.
[ALC-15] Tricks of the Trade: Turns a Good Condition into 20 CP. Extremely useful, when it procs.
[ALC-50] Comfort Zone: 66 CP, returns 80 CP over the next ten steps.
[CUL-15] Hasty Touch: 50% success, 100% Efficiency Quality Raise.
[CUL-37] Steady Hand 2: +30% success rates on all skills for five steps.
[CUL-50] Reclaim: 55 CP, 90% Chance to return items from a failed synth. Persists once activated, but you won't really want to use it unless you have to restart the synth.
Universals:
[07] Master's Mend: 92 CP, returns 30 durability. Least CP Efficient Durability return.
[09] Steady Hand: 22 CP, +20% success for five steps. Useful, and cheaper for closing out with 90% success skills.
[11] Inner Quiet: 18 CP, stacks to 11 (first doesn't count) and each stack adds approx 20% to your Touch(Quality) skills returns. So, 120%, 140%, 160%... 300%.
[21] Great Strides: 32 CP, 2x Quality Modifier for a single Touch skill. Persists 3 steps or until consumed.
[25] Master's Mend 2: 160 CP, returns 60 Durability. The most CP efficient Durability restoration skill, high price tag means that you'll probably only get to use it once, without hitting a LOT of Tricks of the Trade.
Noteable only for hilarity:
[GSM-37] Flawless Synth: 15 CP, 90% Success. FIXED Progress increase of 40.