Jython 3 stable version - python-2.7

What is the latest stable version of Jython? I prefer a new version hopefully v3.x
Is it still recommended to use Jython 2.7.0 Final Released (May 2015)
What is Jython 3 sandbox? Is this a official/recommended one?
In Wikipedia it says about v.2.7.1 released in July 2017. Where can I download this version? (if this is the recommended latest one)

Use this link to download the 2.7.1 version:
You should definitely NOT use the newcomers which aren't stable for production purposes. You can follow guys from their dev team for all info regarding releases.

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Can't install gensim with python 3.4

I cannot install gensim==3.5.0 in my elastic beanstalk environment (python 3.4). I get an error that gensim needs python >= 3.5 to run.
This was not a problem until a mid-day deployment today, that made only project code changes, nothing related to elastic beanstalk, requirements or settings.
At the same time, I'm succesfully running the same version in another identical environment. That means the same pip, same python version, same required dependencies.
I tried lowering the gensim requirement to gensim==0.13.4 which officially supports python 3.4, but I get the same error.
EDIT: I managed to make things work by installing gensim==0.10.0 and then redeploying with gensim=3.5.0. I still don't know the cause of the issue and the solution is not really a solution, so I'm still interested in insights.
Note that currently (July 2019), Python 3.4 itself will no longer be supported with fix releases. Per https://www.python.org/downloads/release/python-3410/:
Release Date: March 18, 2019
Python 3.4 has reached end-of-life. Python 3.4.10 is the final release
of 3.4.
Python 3.4.10 was released on March 18th, 2019.
Python 3.4.10 is the final release in the Python 3.4 series. As of
this release, the 3.4 branch has been retired, no further changes to
3.4 will be accepted, and no new releases will be made. This is standard Python policy; Python releases get five years of support and
are then retired.
If you're still using Python 3.4, you should consider upgrading to the
current version. Newer versions of Python have many new features,
performance improvements, and bug fixes, which should all serve to
enhance your Python programming experience.
That said, if you're truly getting an error about gensim's require Python level, truly rolling back to whatever version of gensim you were using successfully, previously, with Python 3.4 should work. (That might not need to go as far back as gensim-0.13.4.1, which is almost 2.5 years old, but if you're sure that's the version that was working for you, you could use that version.)
You should edit your question to show exactly what installation commands you've run, and exactly which message is received in response to which step, to more clearly indicate what's been tried, where the error is arising, and why a simple attempt to install-an-older-version might be getting a similar error message.

How do I install an older version of Crystal Lang?

The documentation explains how to install the newest version, but I need a specific (older) version. Could someone help me with the best way to accomplish that?
The official deb & rpm repositories don't provide the previous Crystal releases. We know we want to improve that at some point in time, but it's not happening yet.
If you're on macOS/using Homebrew, you can try installing a Homebrew formula's old version. There might be a similar procedure in Linuxbrew. And I'm not sure about Arch's situation.
Official Docker images go as far as 0.13, in case that helps.
And you can always install Crystal from a .tar.gz published on the repository's Releases page. Just pick the version you prefer instead of the latest.
Don't forget that, the older the Crystal version, the less supported it'll be.

Using HtmlAgilityPack NuGet package in dotnet core v1.0

I am trying to use HtmlAgilityPack nuget package in netcoreapp1.0 (I am restricted to this version since AWS Lambda supports only it). Which version of the HtmlAgilityPack package should I use? The point is .NETStandardLibrary 1.6.0 is only compatible with netcoreapp1.0 but I don't see any version of HtmlAgilityPack which would be compatible with .NETStandardLibrary 1.6.0. The minimum version I can see is .NETStandardLibrary 1.6.1 but this is for netcoreapp1.1.
From a .NET Standard API prospective nothing changed between NETStandard.Library 1.6.1 and 1.6.0. We only bumped the version of the meta-package so that we could pull in newer versions of the dependent packages which contain implementation fixes but no real new API surface for NS1.6.
See the issue #171 in DotNet standard repo What's the change in NetStandard.Library 1.6.1 vs 1.6.0?
Even if there will be no HtmlAgilityPack compatible (or build against) netstandard1.6, but there is a netstandard1.6.1 I would just build it for myself by replacing netstandard v1.6.1 nuget package with netstandard v1.6 package ( HtmlAgilityPack is open source - right :) ).
Most importantly there is no netstandard1.6.1, it was never released or even worked on, v1.6.1 stands only for the version of NETStandard.Library NuGet package.

SONARQUBE C++ community plugin 9.0 and lower unavailable

It is known that in "C++ community plugin" version 0.91 onward,
Configuration setting sonar.cxx.cppncss.reportPath is no longer supported.
So i will have to downgrade the plugin lower than 0.9, and i'm not finding in official sonarqube site or any source code.
Do anybody has the Sonar C++ community plugin of any older version lesser than 0.9? please help and share the link.
Older releases are available in maven repository:
http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.codehaus.sonar-plugins%22%20AND%20a%3A%22sonar-cxx-plugin%22
Download:
0.2 - http://repo1.maven.apache.org/maven2/org/codehaus/sonar-plugins/sonar-cxx-plugin/0.2/sonar-cxx-plugin-0.2.jar
0.1 - http://repo1.maven.apache.org/maven2/org/codehaus/sonar-plugins/sonar-cxx-plugin/0.1/sonar-cxx-plugin-0.1.jar

Does the cppunit test frame have different version? if yes, then what is the latest version of it?

Does the cppunit test frame have different version? if yes, then what is the latest version of it?
Yes. The most recent version is 1.12.1.
The project page is at http://sourceforge.net/projects/cppunit/
The latest tagged version is 1.13.2 according to the project's wikipedia entry.
The most recent version is available at https://freedesktop.org/wiki/Software/cppunit/. The development branch is actively updated. Version 1.13.2 was finalized on 2013-11-11.