Your problem is rather simple to understand.
Your title tag is too short and your description meta-tag is short and rather nondescript. Follow that, your h1 tag matches your title tag and is too short and nondescript. Your first h2 tag is also nondescript. Your first paragraph is also short.
In short, you have not given anything for Google to use for a SERP link and snippet. You are breaking enough of the basic SEO on-page ranking signals that your page will never really rank for much. Google is simply finding whatever it can to use for the SERP link and snippet and you have not provided it much to choose from.
I rather suspect you are may be chasing just a few keywords too. It appears you are only ranking for "CMIS".
You will want to stop the keyword chase. It has been a long standing advice that is largely demoted with semantics. Do not get me wrong, you do want to chose a list of keywords and send signals to Google, however, it is also easy to over optimize your site out of view. The important thing to remember is that search engines need textual content and it is always better to perform naturally instead of artificially through too many manual means. Forget all the keyword density stuff. It is a myth. Just a few uses of important keywords in the proper way can make your site rank well enough. What is also important to know is that you want your content to weigh in search and to have enough content diversity to expand search- not narrow it down.
Remember that search competition is stiff. It takes content to rank.
I am curious about cmissync.org versus cmissync.com where the .com version is optimized slightly better and performs slightly better. Still, cmissync.com is rather weak and can be improved significantly.
I am not sure why there are two websites for the same thing.
Generally speaking, it is better to make one site rank really well instead of dividing your efforts. It can make sense to make more than one website rank for multiple markets, but I am not sure that is what you are trying to do.
In your case, I would remove your .org site and do a blanket 301 redirect to the .com site. You will lose nothing at this point. If that is not what you want to do, then each site has to perform differently to attract a completely different audience.
The best thing I can do to answer your question, is reference some answers to help you rank better. You may want to ignore the titles and the question specifically and just take out of the answers what you need. There is some overlap, but there are gems in each answer so it will pay to read them.
Regarding the title tag:
Title tag different from title appearing in Google?
My title tag doesn't appear to be getting crawled by Google properly
Title in Google does not match <title> of document
Regarding on-page optimization:
Improve Google ranking for general vs. specific keywords
SEO on Single Page Website and Content keywords
Website logo text - best tag for SEO purposes?
Regarding using URL/URI for optimization:
Well structured URLs vs. URLs optimized for SEO
<h1> - Semantic impact vs. SEO impact
Why would a website with keyword stuffing rank higher than one without in google search results?
The last advice I would give you is to never use an image for a header tag. In your case, you are using an image for your h1 tag. This does nothing for you. You can certainly use an image, but not as a header. Your header tags should be text since search engines use this as important signals.
Regarding headers and content blocks:
Headers vs. lists vs. sections vs. articles for SEO
This is more than enough reading to help get you started. If you have specific questions, post it here and I will be glad to answer them.