Gather IOT data from different sources

So I'm looking for a way to collect data from different sources like IOT devices, webservices etc.

My main goal ist to have all data in one place and where I can build one API/webservice around so I can use the data for e.g. home automation.

Devices/services I'd like to collect data from are

• Netatmo weather station
• Bloomsky SKY2 & STORM
• Withings scale
• Traffic data
• Weather forecast data
• IFTTT (RSS)
• Custom channels ...

I know that there are already some services out there but some are old and not maintained, don't support all channels that I need, are too expensive for private usage ($10-$15 is OK).

The last thing I had a look for self hosting was openHab, which is nice but more for home automation and not for logging/storing data.

So my question is, is there any free/paid service or open source self hosting out there which could fit my needs?

I've thought about building my own, but as an full time software developer I'd rather spend my free time with something else