As usual, use Maven Central (via Maven or Ivy/Gradle/SBT) to download the artifacts automatically.

Or have a look at this m2 repository location.

Source code can be found at GitHub: 
https://github.com/ops4j/org.ops4j.pax.web

a certain version can be retrieved as tag, for example version 3.2.3 can be retrieved via https://github.com/ops4j/org.ops4j.pax.web/tree/web-3.2.3. In general just add /tree/web-<version> to the URL above. 

Pax Web 4.2.x line

Latest release

Pax Web 4.1.x line

Latest release

The latest release is Pax Web 4.1.4

Pax Web 4.0.x line

Latest release

The latest release is Pax Web 4.0.2

Pax Web 3.2.x line

Latest release

The latest release is Pax Web 3.2.3

Pax Web 3.1.x line

Latest release

The latest release is Pax Web - 3.1.2.

Source code

You can browse, download and checkout the source code at https://github.com/ops4j/org.ops4j.pax.web/tree/web-3.1.2

Pax Web 3.0.x line

Latest release

The latest release is Pax Web - 3.0.5.

Download distribution

see the latest release.

Source code

You can browse, download and checkout the source code at https://github.com/ops4j/org.ops4j.pax.web/tree/web-3.0.5

Pax Web 2.1.x line

Latest release

The latest release is Pax Web - 2.1.4.

Download distribution

see the latest release.

Source code

You can browse, download and checkout the source code at https://github.com/ops4j/org.ops4j.pax.web/tree/web-2.1.1.

Pax Web 1.1.x line

Latest release

The latest release is Pax Web - 1.1.14 and you may download this distribution using:

Source code

You can browse, download and checkout the source code at http://github.com/ops4j/org.ops4j.pax.web/tree/web-1.1.13/.

Development snapshots

If you wanna leave on edge you may wanna use the latest snapshots available from OPS4J Maven snapshots repository.
This snapshots are built on each Pax Web commit.

Build your own

If you wanna make changes of your own or you wanna have your own built version of Pax Web you can build it from source.

Previous releases

Version reached eol

Pax Web 1.0.x line (EOL reached)

Latest release

The latest release is Pax Web - 1.0.12. It's superseded by the 1.1.x line, no further development here.

Download distribution

see the latest release.

Source code

You can browse, download and checkout the source code at http://github.com/ops4j/org.ops4j.pax.web/tree/web-1.0.12/.

Pax Web 2.0.x line (EOL - Reached)

Latest release

The latest release is Pax Web - 2.0.3. It's superseded by the 2.1.x line, no further development here.

Download distribution

see the latest release.

Source code

You can browse, download and checkout the source code at https://github.com/ops4j/org.ops4j.pax.web/tree/v2.0.2.