eBPF (extended Berkeley Packet Filter) lets you attach tiny sandboxed programs to kernel events: syscalls, network packets, scheduler decisions, and filesystem calls. You collect detailed performance data in real time. No kernel source changes, no custom modules, no service restarts. With bpftrace one-liners and the BCC toolkit, you can measure per-process disk latency, trace TCP connections, profile CPU hotspots, and find memory leaks on production Linux. Overhead is usually under 2%.

On Wayland with GNOME 46+ or KDE Plasma 6.1+, each monitor gets its own scale factor. A 4K center display at 200% and side 1080p monitors at 100% work without trade-offs. X11 still hurts here. The whole desktop shares one scale, so one display always looks wrong. If old Linux DPI pain has kept you on a single monitor, the 2026 Wayland stack has caught up.

Why Mixed DPI Is Hard

The typical developer setup pairs a 27" 4K center monitor (163 PPI) with one or two 24" 1080p side panels (92 PPI). That’s nearly a 2x pixel density gap. The OS has to draw UI elements at different sizes on each screen.

Pair Restic with Rclone and you get client-side AES-256 encryption, smart deduplication, and a backend that talks to 70 plus cloud providers. A systemd timer and a short wrapper script handle the schedule. The result runs unattended, prunes old snapshots on its own, and lets you swap clouds by editing one config line. A tuned setup backs up 500 GB in under five minutes and costs as little as $3 a month on Backblaze B2.

For most Linux desktop users, Flatpak is the best universal packaging format in 2026. It offers strong sandboxing through Bubblewrap and Linux namespaces. Its curated app store, Flathub , passed 3,200 apps and 433 million downloads in 2025. Snap fits server and IoT setups where Canonical’s store and auto-updates help, but slow cold starts hurt it on the desktop. AppImage wins for portable, single-file delivery, yet ships with no sandbox, no updates, and no shared libraries.

Can your consumer router do WireGuard VPN at 800 Mbps, isolate IoT devices into separate VLANs, and kill bufferbloat with a single queue management setting? Stock firmware almost certainly cannot. OpenWrt can.

OpenWrt is a full Linux distribution that replaces the limited manufacturer firmware on compatible routers. The router ends up behaving more like a managed switch and enterprise firewall than the box your ISP sent you. The current stable release is OpenWrt 25.12.2 (March 2026), which introduced the apk package manager (replacing opkg) and now supports over 2,200 devices. Flashing typically takes five minutes and is reversible if you keep a backup.

Every SSH connection needs the right host, port, user, and sometimes a specific key, and there is no good place to write all that down outside of ~/.ssh/config. That file stays the most underused tool in any developer’s home directory. Without it you retype ssh deploy@10.0.4.17 -p 2222 -J bastion.example.com every session, forget which IP belongs to which server two weeks later, and end up with a shell history full of nearly identical commands.