diff --git a/README.md b/README.md
index 6feb2a9..9752c3b 100644
--- a/README.md
+++ b/README.md
@@ -566,6 +566,10 @@ the command reference.
 | Example | Description |
 |---|---|
 | [basic](examples/basic/) | List projects and users |
+| [calendar](examples/calendar/) | List calendars and events, create a new event |
+| [crm](examples/crm/) | List contacts and opportunities, add company/deal/history note |
+| [subtasks](examples/subtasks/) | Create a parent task and attach subtasks |
+| [applications](examples/applications/) | Job application folder tree → OnlyOffice CRM (library-level usage of the internal applications package) |
 | [`cmd/oo-cli`](cmd/oo-cli/) | Full-featured CLI using all modules |
 
 ## Related Libraries
diff --git a/examples/applications/main.go b/examples/applications/main.go
new file mode 100644
index 0000000..b94bf7f
--- /dev/null
+++ b/examples/applications/main.go
@@ -0,0 +1,54 @@
+// Package main shows how to drive the internal applications package — the same
+// logic that powers `oo-cli applications-sync` — directly from Go code.
+//
+//	export ONLYOFFICE_URL="https://your-instance.onlyoffice.com"
+//	export ONLYOFFICE_USER="admin@example.com"
+//	export ONLYOFFICE_PASS="your-password"
+//	go run ./examples/applications /path/to/cv/applications
+//
+// Without --apply equivalent, it prints a summary but performs no writes.
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+
+	onlyoffice "github.com/eslider/go-onlyoffice"
+	"github.com/eslider/go-onlyoffice/internal/applications"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "usage: applications <applications-root>")
+		os.Exit(2)
+	}
+	root := os.Args[1]
+
+	creds := onlyoffice.GetEnvironmentCredentials()
+	if creds.Url == "" {
+		fmt.Fprintln(os.Stderr, "ONLYOFFICE_URL is not set")
+		os.Exit(1)
+	}
+	client := onlyoffice.NewClient(creds)
+
+	paths, err := applications.Discover(root)
+	if err != nil {
+		log.Fatalf("discover: %v", err)
+	}
+	fmt.Printf("discovered %d application READMEs under %s\n", len(paths), root)
+
+	var apps []applications.Data
+	for _, p := range paths {
+		d, err := applications.ParseReadme(p)
+		if err != nil {
+			log.Printf("parse %s: %v", p, err)
+			continue
+		}
+		apps = append(apps, d)
+	}
+
+	stats := applications.Sync(context.Background(), client, apps, true /*dryRun*/, true /*verbose*/)
+	fmt.Printf("\ndry-run stats: %+v\n", stats)
+}
diff --git a/examples/calendar/main.go b/examples/calendar/main.go
new file mode 100644
index 0000000..59c7f44
--- /dev/null
+++ b/examples/calendar/main.go
@@ -0,0 +1,62 @@
+// Package main shows how to list calendars and events, and create a new event
+// via the OnlyOffice Calendar API.
+//
+//	export ONLYOFFICE_URL="https://your-instance.onlyoffice.com"
+//	export ONLYOFFICE_USER="admin@example.com"
+//	export ONLYOFFICE_PASS="your-password"
+//	# optional: default calendar for AddEvent
+//	export ONLYOFFICE_CALENDAR_ID="42"
+//	go run ./examples/calendar
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	onlyoffice "github.com/eslider/go-onlyoffice"
+)
+
+func main() {
+	creds := onlyoffice.GetEnvironmentCredentials()
+	if creds.Url == "" {
+		fmt.Fprintln(os.Stderr, "ONLYOFFICE_URL is not set")
+		os.Exit(1)
+	}
+
+	client := onlyoffice.NewClient(creds)
+	client.SetDefaults(onlyoffice.GetEnvironmentDefaults())
+
+	ctx := context.Background()
+	start := time.Now().Format("2006-01-02")
+	end := time.Now().AddDate(0, 1, 0).Format("2006-01-02")
+
+	calendars, err := client.ListCalendars(ctx, start, end)
+	if err != nil {
+		log.Fatalf("list calendars: %v", err)
+	}
+	fmt.Printf("Calendars (%d):\n", len(calendars))
+	for _, cal := range calendars {
+		fmt.Printf("  - id=%v title=%v\n", cal["objectId"], cal["title"])
+	}
+
+	events, err := client.ListEvents(ctx, start, end)
+	if err != nil {
+		log.Fatalf("list events: %v", err)
+	}
+	fmt.Printf("\nEvents in [%s..%s]: %d\n", start, end, len(events))
+	for _, e := range events {
+		fmt.Printf("  - %v @ %v\n", e["title"], e["start"])
+	}
+
+	// Create demo event — uncomment to exercise.
+	// evStart := time.Now().Add(time.Hour).Format(time.RFC3339)
+	// evEnd := time.Now().Add(2 * time.Hour).Format(time.RFC3339)
+	// created, err := client.AddEvent(ctx, "", "Library demo", evStart, evEnd, "via examples/calendar", false)
+	// if err != nil {
+	// 	log.Fatalf("add event: %v", err)
+	// }
+	// fmt.Printf("created event id=%v\n", created["objectId"])
+}
diff --git a/examples/crm/main.go b/examples/crm/main.go
new file mode 100644
index 0000000..3850227
--- /dev/null
+++ b/examples/crm/main.go
@@ -0,0 +1,63 @@
+// Package main lists CRM contacts and opportunities, and shows how to create
+// and remove a demo company + opportunity + history note in OnlyOffice CRM.
+//
+//	export ONLYOFFICE_URL="https://your-instance.onlyoffice.com"
+//	export ONLYOFFICE_USER="admin@example.com"
+//	export ONLYOFFICE_PASS="your-password"
+//	go run ./examples/crm
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+
+	onlyoffice "github.com/eslider/go-onlyoffice"
+)
+
+func main() {
+	creds := onlyoffice.GetEnvironmentCredentials()
+	if creds.Url == "" {
+		fmt.Fprintln(os.Stderr, "ONLYOFFICE_URL is not set")
+		os.Exit(1)
+	}
+
+	client := onlyoffice.NewClient(creds)
+	ctx := context.Background()
+
+	contacts, total, err := client.ListContacts(ctx, 10, 0, "")
+	if err != nil {
+		log.Fatalf("list contacts: %v", err)
+	}
+	fmt.Printf("CRM contacts: %d (total=%d)\n", len(contacts), total)
+	for _, c := range contacts {
+		fmt.Printf("  - id=%v name=%v\n", c["id"], c["displayName"])
+	}
+
+	opps, oppTotal, err := client.ListOpportunities(ctx, 10, 0)
+	if err != nil {
+		log.Fatalf("list opportunities: %v", err)
+	}
+	fmt.Printf("\nOpportunities: %d (total=%d)\n", len(opps), oppTotal)
+	for _, o := range opps {
+		fmt.Printf("  - id=%v title=%v\n", o["id"], o["title"])
+	}
+
+	// Full create/attach/delete cycle — uncomment to exercise.
+	// company, err := client.CreateCompany(ctx, "Demo GmbH")
+	// if err != nil { log.Fatalf("create company: %v", err) }
+	// cid := fmt.Sprint(company["id"])
+	// defer client.DeleteContact(ctx, cid)
+	//
+	// stages, err := client.ListDealStages(ctx)
+	// if err != nil || len(stages) == 0 { log.Fatalf("no deal stages: %v", err) }
+	// stageID := int(stages[0]["id"].(float64))
+	//
+	// opp, err := client.CreateOpportunity(ctx, "Demo opp", stageID, "", "EUR", "from examples/crm", 0)
+	// if err != nil { log.Fatalf("create opportunity: %v", err) }
+	// oid := fmt.Sprint(opp["id"])
+	// _, _ = client.AddOpportunityMember(ctx, oid, cid)
+	// _, _ = client.AddHistoryNote(ctx, "opportunity", int(opp["id"].(float64)), "Touched via library example", 0)
+	// _, _ = client.DeleteOpportunity(ctx, oid)
+}
diff --git a/examples/subtasks/main.go b/examples/subtasks/main.go
new file mode 100644
index 0000000..d44f4fc
--- /dev/null
+++ b/examples/subtasks/main.go
@@ -0,0 +1,51 @@
+// Package main creates a parent task and attaches two subtasks using the
+// project-tasks API (POST /api/2.0/project/task/{id}.json).
+//
+//	export ONLYOFFICE_URL="https://your-instance.onlyoffice.com"
+//	export ONLYOFFICE_USER="admin@example.com"
+//	export ONLYOFFICE_PASS="your-password"
+//	export ONLYOFFICE_PROJECT_ID="123"
+//	go run ./examples/subtasks
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+
+	onlyoffice "github.com/eslider/go-onlyoffice"
+)
+
+func main() {
+	creds := onlyoffice.GetEnvironmentCredentials()
+	defaults := onlyoffice.GetEnvironmentDefaults()
+	if creds.Url == "" || defaults.ProjectID == "" {
+		fmt.Fprintln(os.Stderr, "ONLYOFFICE_URL and ONLYOFFICE_PROJECT_ID must be set")
+		os.Exit(1)
+	}
+
+	client := onlyoffice.NewClient(creds)
+	client.SetDefaults(defaults)
+	ctx := context.Background()
+
+	parent, err := client.AddTask(ctx, defaults.ProjectID, "Example parent", "Created by examples/subtasks", 0, "")
+	if err != nil {
+		log.Fatalf("add parent task: %v", err)
+	}
+	parentID := fmt.Sprint(parent["id"])
+	fmt.Printf("parent task id=%s\n", parentID)
+
+	for _, title := range []string{"first subtask", "second subtask"} {
+		st, err := client.AddSubtask(ctx, parentID, title)
+		if err != nil {
+			log.Fatalf("add subtask %q: %v", title, err)
+		}
+		fmt.Printf("  + subtask id=%v title=%v\n", st["id"], st["title"])
+	}
+
+	// Cleanup — uncomment once you verified the subtasks in the OnlyOffice UI.
+	// if _, err := client.DeleteTask(ctx, parentID); err != nil {
+	// 	log.Printf("cleanup: %v", err)
+	// }
+}