A few things from My Traveller Universe :
Lampvine - this is a gene-engineered ivy that has the gene for phosporescence added to it. The plant begins to glow when the light level drops below a threshold level. The rest of the time, it operates using normal photosynthasys to grow and release oxygen. The vine has no root system, growing from moisture in the air like some lichen. This plant is very hardy and easy to care for. Light released is about the same as a weak chem-light glow stick. It glows one hour for every two hours it is exposed to light above the threshold level. Good for planting here and there to keep from hitting your shins on things when you're the first one in the office in the morning (TL 10, Cr50 for a small plant,but most people get a cutting from a co-worker in the office)
GenieRing - this is a somewhat gaudy signet ring with a small voice-operated computer. It supports the Imperial equivlant of WiFi and can log into the Internet on most TL11+ worlds. The Genie handles email and limited web searches as well as having a VOIP phone capability. There is also an appointment reminder function and addreess book. (Basically , the things one can do with a current real-world PDA that don't involve graphics - the text is read back to the user. ) The wearer operates the device by saying, "Genie, email my wife that I'm running late and will be home around 9PM. " or "Genie, doctor's appointment tomorrow 3:00 PM". The Genie says things like, "Master, reminder: Doctors appointment in 20 minutes" (TL12, cr 200-1500+ depending on quality of ring , computer, and software)
Lift Gum - Lift (tm) is a chewing gum with small time-release crystals of stimulant. It is available in 7 "flavors" based on the spectrum (Roy G Biv), each having a stronger dose. The stimulant is designed for humans, and contains caffine, B6, B12 and a variety of other things, including some synthetic hormones/steroids. Chew time is about 30 minutes, during which the user gets a continued dose. Red (cherry) is about like a cup of coffee. Violet is about like a 200mg dose of Provigil. Add the dosage level (1-7) to Law Level and roll over that for it to be legal on a given world. Generally,as long as possession doesn't exceed the pack in your pocket the police won't hassle you... but "intent to distribute" can get you in trouble. (TL 9, cr 1-7 per pack of 5 sticks)
Variable Tool - This device uses a nanotech polymer that changes shape based on verbal commands given to a coin-sized computer embeded in it. The "inert" command returns it to a 1cm diameter by 4cm long cylinder shape. Other commands include "Screwdriver', "Pliers" , "wrench" , "Knife", "Opener" , "pick" and many others. The subcommands also include options to adjust the tool . For example, "Screwdriver Phillips #2" or "Pliers Needlenose. Shorter. Shorter. Thinner. " or "Wrench Box 5mm" would be valid command strings spoken to it. The device can also be set to verbally report voltage, amperage, resistance and capacitance as well as the amount of torque being pushed on the pliers or wrench. It does not heat up like a soldering iron or torch, and the material is not durable enough to be used as a metal file (it can file or saw soft wood or plastic) (TL14, cr750)
JoyStique - This is a Variable Tool (see above) with special options that are intended for private biological activites. Different settings accomidate users of various genders and species. (TL 14, cr 1500.... or cr 2500 for one that also does what a VariableTool does and pretends to be one when handled while the owner isn't present.)