Technical Details
BcalcOS is assembled from capable, proven components.
What BcalcOS is made of.
Individual components, each good at its job, that work well together.
Devuan
Operating system foundation
sysvinit
System initialization
XLibre
Display server
SLiM
Display manager
Xfce
Desktop environment
Devuan
The foundation.
Every desktop shouldn't be required to follow the same architectural path. Different systems have different goals, and users benefit when those differences remain possible. Devuan agrees.
Devuan is a Debian fork maintained explicitly to preserve init system choice and avoid forced architectural decisions. Packages that work with traditional init systems are available without systemd. This gives the user access to decades of package maturity while respecting individual system design choices.
sysvinit
Keep the first job simple.
The init system has an important job: bringing the system up, starting services, and helping manage the transition between system states. Sysvinit is mature, well understood, and does the job needed. It uses numbered runlevels and sequential service startup. This means: services start in order (predictable), failures are visible in chronological boot logs (debuggable), and service dependencies are explicit and human-readable.
Simpler is usually better. That doesn't mean every simple solution is correct or that complexity is always bad. But, yeah, simpler software is usually better.
SysVinit: System Initialization
Living Without Systemd
XLibre
Choose what works.
XLibre provides continued development of the X11 graphical environment. It is a community-managed continuation of the X.Org X server, with ongoing work on graphics performance, hardware support, security, and compatibility. XLibre includes modern rendering technologies such as GPU-accelerated GLAMOR, improved modesetting with TearFree enabled by default, and continued development of the X11 graphics stack. It also maintains compatibility with the broad ecosystem of X11 applications and graphics hardware that has developed over decades.
Change may be constant but newer does not automatically mean better. Technology, useful technology, should be judged by its technical merits: does it work, is it capable, is it maintainable, and does it fit the system being built.
Why BcalcOS Uses XLibre
XLibre: Things to Know
SLiM
It doesn't need to do more.
SLiM loads in seconds and consumes minimal memory with no dependency on heavyweight libraries. It auto-detects available desktop sessions and lets users choose one at login. The config file is plain text, themes use a simple templating system, and it handles the critical job (authenticate, launch session, exit) without feature bloat.
It does its job and then stays out of the way.
SLiM: The BcalcOS Display Manager
Xfce
A solid desktop.
Xfce is built from independent, interoperable components. You can use just Xfwm4 (the window manager) with a different panel, replace the file manager, customize the desktop background handler separately. This modularity means users can assemble their exact environment. Idle memory usage is light enough to run on modest hardware. Most components have keyboard shortcuts.
It's familiar out-of-box yet user customizable.
BcalcOS Theme & Icons
Each component is deliberately chosen to excel at one thing—and to work well with the others without hidden dependencies or feature overlap.
- Simplicity is valuable.
- Should be multiple ways to build a desktop.
- Software is judged by its technical merits.
- Old software can still be useful.
- Components should have clear purposes.
Download BcalcOS.
Give it a spin. Risk free.