Relational Database Management Systems

• MySQL
• MariaDB (MySQL fork)
• Drizzle (MySQL fork)
• A look at the MySQL forks (LWN)
• PostgreSQL
• Apache Derby (in Java)
• One$DB (Daffodil DB)
• MaxDB (SapDB)
• Firebird (based on Interbase version 6)
• Ingres
• Open Source Database Engines in Java

LDAP Servers:

• OpenLDAP
• 389 Directory Server (former Fedora Directory Server, derived from Netscape’s Directory Server)
• ApacheDS (in Java)
• OpenDS (in Java)
• Comparison

ERP Systems:

• OpenERP (there is also a web page in Spanish)
• Tryton (fork of TinyERP, before changing into OpenERP)
• Compiere (in Java)
• Adampiere (fork of Compiere)
• OpenBravo (fork if Compiere, from Navarra, Spain)
• OpenXpertya (fork of Compiere, from Asturias, Spain)
• AbanQ
• BulmaGes
• Araña Gestión
• Fisterra
• Dolibarr
• OpenAguila
• Neogia
• SQL-Ledger
• Ledger-SMB (derivative from SQL-Ledger)
• CK-ERP (project in SourceForge)
• xTuple PostBooks
• Stoq

Version Control Systems

• CVS
• Subversion (svn)
• Darcs
• Bazaar (bzr)
• Mercurial (Hg)
• Git
• Svk
• A very funny comparison

Compilers

• GNU Compiler Collection (GCC)
• LLVM/Clang
• Portable C Compiler (PCC)
• Tiny C Compiler (TCC)

SWF (Flash) Players:

• Gnash (FSF’s GNU Project)
• Swfdec

Multimedia conversion:

• HandBrake – Video transcoder
• FFmpeg – Record, convert and stream audio and video
• dvd::rip – DVD copy program, ripping and transcoding
• ogmrip – Rip and encode DVD into AVI, OGM, MP4, or Matroska files
• k9copy – Linux DVD shrink
• XDVDShrink – DVDShrink for Linux
• MJPEG Tools – Recording of videos, playback, simple cut-and-paste editing and the MPEG compression of audio and video
• MKVToolnix – Tools to work with Matroska files, including mkvmerge GUI (or just mmg)
• Transcode – Command line utilities
• MEncoder – Command line video decoding, encoding and filtering tool. It’s a close sibling to MPlayer

Screencast

• recordMyDesktop – Captures audio-video data of a Linux desktop session
• Xvidcap – Screen video capture for X

Scientific tools

• gnuplot – Command-line driven interactive plotting program
• GNU Octave – Language for numerical computations
• Scilab – Scientific software package for numerical computations
• MayaVi – Scientific data visualization system
• OpenDX – IBM Visualization Data Explorer
• Maxima – Computer algebra system
• Spyder – Python working environment
• SAGE – Free open-source mathematics software system
• FreeMat – Free environment for rapid engineering and scientific prototyping and data processing

Free / Open Source lists of projects:

• Linux App Finder
• The Linux Game Tome
• The Linux Alternative Project
• Open Source as Alternative
• Free Alternatives
• Free and Open Source Software Directory
• List of Open Source Packages in the Wikipedia
• Data visualization tools for Linux

Just for me, as I don’t want to forget how to rip difficult/corrupted DVD VOB files:

sudo mount -o loop file.iso /mnt
export IN=”/mnt/VIDEO_TS/VTS_01_1.VOB”
export OUT=”vob01_1.avi”

mplayer “${IN}” -identify
mplayer “${IN}” -aid 128 -ao pcm:file=audio_es.wav -vc dummy -vo null
mplayer “${IN}” -aid 129 -ao pcm:file=audio_en.wav -vc dummy -vo null

Choose one:

mencoder “${IN}” -nosound -noautosub -mc 0 -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=6000:ilme:ildct -o video.avi
mencoder “${IN}” -nosound -noautosub -mc 0 -vf pp=ci,scale=720:576 -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=6000:ilme:ildct -o video.avi
mencoder “${IN}” -nosound -noautosub -mc 0 -vf pp=ci,scale=720:576 -ovc xvid -xvidencopts bvhq=1:chroma_opt:quant_type=mpeg:bitrate=1000 -o video.avi
mencoder “${IN}” -nosound -noautosub -mc 0 -vf pp=ci,scale=720:576,crop=704:416:10:82 -ovc xvid -xvidencopts bvhq=1:chroma_opt:quant_type=mpeg:bitrate=1000 -o video.avi

ffmpeg -vcodec copy -i video.avi -acodec copy -i audio_es.wav “${OUT}” -newaudio -acodec copy -i audio_en.wav

You can use “mplayer file.avi -vf cropdetect” to find out the crop parameters

Concatenate all avi files:
avimerge -o final.avi -i first_file.avi second_file.avi