I'm the lead developer of TortoiseSVN. I joined the project in its very early stages when it wasn't even usable, and I've been working on it ever since.

Of course, I always appreciate kind donations:
http://tortoisesvn.net/donate_stefan Contributes to TortoiseSVN, CommitMonitor, grepWin, StExBar, favIconizer, demoHelper, TrafficWatcher, SVNProtocolHandler, Subversion, MailNoter, and Gurtle.

Contributes to grep, GNU Diff Utilities, GNU sed, LVM, oVirt, Linux Kernel 2.6, linux-davinci, GNU Emacs, linux-omap, util-linux-ng, gnulib, GNU Automake, GNU Autoconf, GCC, the GNU Compiler Collection, GNU Make, GNU Core Utilities, Git, CVS: Concurrent Versions System, Qpid - Open Source AMQP, GNU Parted, GNU Bison, cobbler, PolicyKit, Augeas, livecd-tools, Advanced Linux Sound Architecture (ALSA), FreeIPA, Perl, GNU idutils, Fedora Live Tools, virt-factory, Cairo, XZ Utils, LZMA Utils, btrfs, libgitcore, GNU findutils, linux-cluster, Device Mapper, corosync, openAIS, libguestfs, e2fsprogs, gzip, libvirt, GNU C Library, and Mercurial.

Contributes to ALE - ALignment Editor, cvs2cl, onetime, LabelNation, Subversion, GNU Emacs, CVS: Concurrent Versions System, ProducingOSS, Puppet, Cvs2Svn, Apache Portable Runtime, OpenOffice.org, Bazaar Version Control, and svnbook.

Contributes to phpMyAdmin.

Contributes to XULRunner, Mozilla Core, Mozilla Firefox, Thunderbird, Mozilla Calendar, SeaMonkey, ChatZilla, Mozilla Rhino, Camino, Persian Firefox, SpiderMonkey, DOM Inspector, extensiondev, MXR Cross Reference, Mozilla Fennec, and Venkman.

Contributes to Mozilla Firefox, Mozilla Core, and Chromium (Google Chrome).

Contributes to GNU Make, GNU C Library, GNU binutils, OpenEZX, Linux Kernel 2.6, GNU Autoconf, GNU Emacs, Gnu Hurd, strace, Netutils, GNU Diff Utilities, GDB, Fedora Packages, Cygwin, GNU Automake, linux-libc-kernel-headers, config, KVM, linux-omap, OpenVZ, gnulib, GNU InetUtils, linux-davinci, Openmoko, btrfs, systemtap, and elfutils.