Hi,
Recently I have ad popups in my browser. I think they are from thingspeak.com. So I would like to move away from thingspeak as soon as possible.
I have my own website, but I don't know how to use PHP or mySQL.
What is the best option for a simple display of my data ?
ThingSpeak
I like the way the data is shown, and the API is simple.
There are public channels, to see examples : Public Channels - ThingSpeak IoT
Adafruit.io
"Coming soon". Well, that's not soon enough for me. I want it today.
the thing system
Is this compatible with Arduino ? I think it is not.
Temboo
That website is very confusing. Are there examples somewhere ? or public pages of projects ? Is it possible to show the temperature in a graph for a few days ? I have really no idea what it is.
Xively
Another totally confusing website. Do they target at companies now ? Is it compatible with Arduino ?
SpaceBrew
It seems like a barebone IoT site. I would like to see real examples with graphs of temperature and so on. I don't know if that is possible with this site.
XOBXOB, Zetta and there are many others, but I have no idea what they are.
Any suggestions what I should do ?
but I don't know how to use PHP or mySQL.
If your web hosting company supports them, learn. It only takes a little bit of code to read and write to a database. If you needed it I could send you examples!
My web hoster supports almost everything. I tried to learn how to use a few of them, and I had a simple PHP running, but I really didn't understand the rest. Sorry, that's too hard for me now, and I don't have the time to seriously study it 
I like Thingspeak, fairly basic website but easy to get going and long-term storage of data. If the popup ads are a problem then install adblocker or similar and relax.
Xively (formerly cosm, formerly pachube) is now heavily commercial so probably not good if you are starting from scratch although its definitely arduino-compatible.
There are some lists of alternatives at
https://alternativeto.net/software/xively/
although I've not personally used any of them. Depending on your needs you have to read the docco closely as many sites only offer a few days or months of data storage.
Well, I don't relax at all 
I want my computer to be very secure. A popup-ad really scares me. Luckely it was not a virus but a webpage in my browser that caused it. However, even then a popup-ad should never occur.
Thanks for the links. I think I wait for Adafruit.IO, until then perhaps www.grovestreams.com
Yes, Grovestreams appears to be the one you left out but a good prospect if Xively have gone commercial. There was discussion about Grovesteams <> Xively a year or so ago. None of the others appear to merit consideration. The Grovestream crowd will talk to you while xively stumbled there
I dont think https://data.sparkfun.com/ was mentioned anywhere either. Again I havent personally used it but it appears to be a drop-in replacement for thingspeak or xively.
Sorry for the topic necromancy, but you should try the https://iotguru.cloud, the feature set similar to Thingspeak without MathLab analysis.
you have to learn php,sql (back end ) and front end as that makes your IoT really versatile
i was in your shoes, few years ago but i was able to make this
http://mwananyamala.000webhostapp.com/air_quality/login.php
that one logs bunch of sensor data ( from arduino + LTE modem ) to a web page
those ready made platforms are creepy,
i was huge fan of Xively back then, till they just got too pricey for their creepy plans
well that what forced me into 'learning web scripting'