You can have a look at LAStools for LIDAR processing. Also, go through a similar Q&A in RG. Links are attached.

http://rapidlasso.com/LAStools/

https://www.researchgate.net/post/Can_somebody_help_me_to_choose_the_best_method_for_LIDAR_data_management_with_open_source_tools

Terrascan, Terra match and Terra Modeler are lidar data processing software, it can be download from www.terrasolid.fi. Now ArcGIS also include lidar processing tool and Global Mapper also reads lidar points.

Thank you both for help :)

I have already used LAStool from Martin and it's quite ok but there could be some problems when you have lots of points. Thank you for a link as well.

As for ArcGIS it has rather simple algoritms. I need sth more advancd to chceck classification or even reclassify the cloud.

I suggest to have a look at Computree, an open source platform dedicated to lidar data processing : http://computree.onf.fr/?lang=en

CloudCompare does an excellent  job with large LAS files and can build TIN and Raster surfaces. There are also lots of other tools.

http://www.cloudcompare.org/

As for CloudCompare it seem to be really nice software but i cannot see any tool for interpolation (TIN or raster) there.

Links below to the CloudCompare wiki on how to produce raster and TINs.

http://www.cloudcompare.org/doc/wiki/index.php?title=Rasterize

http://www.cloudcompare.org/doc/wiki/index.php?title=Mesh%5CDelaunay_2.5D_(XY_plane)

http://www.cloudcompare.org/doc/wiki/index.php?title=Poisson_Surface_Reconstruction_(plugin)

Thank you for help :)

Hi, you may try using Dielmo3D products for Lidar data processing. Also try lidar2dems (ref: http://applied-geosolutions.github.io/lidar2dems/). All the best! 

I suggest you to try the Fusion from de USDA Forest Service (http://forsys.cfr.washington.edu/fusion/fusionlatest.html)

You can try LiDAR360,  it contains tools for generating DEM、DSM and other spatial products. It also provides tools for DEM editing.

(http://greenvalleyintl.com/product/lidar360/)

If your interested in making your own tools or workflows you can try: 

Point Cloud Library (http://pointclouds.org) 

VCG Library (http://vcg.isti.cnr.it/vcglib/) 

libLAS (https://www.liblas.org/start.html) 

GRASS GIS for Lidar data processing is also a good open source option

.

https://grasswiki.osgeo.org/wiki/LIDAR

As suggested above, I would definitely recommend CloudCompare and LAStools.

In my opinion, CloudCompare is the most complete and easiest open source software for point cloud data. Apart from basic tools, it has included some very nice third-party open source tools that are extremely useful when processing LiDAR data.

Archana Joshi ma'am your solution only deals with LAS format data could you please advise anything for converting PCAP to LAS

OpenTopography provides access to points clouds as well as a long list of developed tools for processing ALS point clouds. A large number of tools available are open source. PLEASE CHECK THIS LINK.

https://portal.opentopography.org/tools/listTools

Thanks for your answer, Mr.Nadeem Fareed

From my experience, I would recommend Cloud Compare for Lidar post-processing. However, if you used TerraScan for post-processing before, believe me man it's hard to find something similar :(

Best of luck

I develop WhiteboxTools, an open-source geospatial analysis software package that has significant LiDAR processing capabilities.

LidR package, R programming is quite handy for your requirements.

GitHub - Jean-Romain/lidR: R package for airborne LiDAR data manipulation and visualisation for forestry application

Apart from CloudCompare, those who are more interested in forestry applications may try 3DForest, LiForest, DendroCloud and Treeseg-master softwares.